Indeed, The moral/ethical law of love of God and love of neighbor (i.e., the Law of Christ)
Messiah's law is YHWH's law, the Torah of Moshe.
(CLV) Dt 6:5
So you will love YHWH your Elohim with all your heart and with all your soul and with all your intensity.
(CLV) Lv 19:18
You shall not avenge nor shall you be resentful against the sons of your people. You will love your associate as yourself: I am YHWH.
(CLV) Ec 1:9
What occurred once, it shall occur again, And what was done, it shall be done again. There is nothing at all new under the sun.
(CLV) 1Jn 5:3
For this is the love of God, that we may be keeping His precepts. And His precepts are not heavy,
(CLV) Dt 30:10
when you hearken to the voice of Yahweh your Elohim to observe His instructions and His statutes, the ones written in this scroll of the law, once you return to Yahweh your Elohim with all your heart and with all your soul.
(CLV) Dt 30:11
For this instruction that I am enjoining on you today, it is neither too difficult for you, nor is it too far off.
(CLV) Dt 30:12
It is neither in the heavens for you to say: Who shall ascend to the heavens for us and take it for us and announce it to us that we may do it?
(CLV) Dt 30:13
Nor is it across the sea for you to say: Who shall cross across the sea for us and take it for us and announce it to us that we may do it?
(CLV) Dt 30:14
For the word is exceedingly near to you, in your mouth and in your heart, to do it.
(CLV) Dt 30:15
See! I have set before you today life and good, death and evil.
(CLV) Dt 30:16
If you should hearken to the instructions of Yahweh your Elohim that I am enjoining on you today, to love Yahweh your Elohim, to walk in His ways and to observe His instructions, His statutes and His ordinances, then you will live and multiply, and Yahweh your Elohim will bless you in the land where you are entering to tenant it.
However in the Scripture referenced int he OP when Paul discusses those "under the law", he is referring to The ceremonial and ritual law of the Temple, as mediated through the Levitical priesthood established under Moses,
Nonsense. Scripture doesn't support that assumption.
The Levitical Priesthood is an eternal covenant. They be making sacrifices in the Kingdom to come.
Ezekiel 43:
19 And you have given unto the priests, the Levites, who [are] of the seed of Zadok--who are near unto Me, an affirmation of the Lord Yahweh, to serve Me--a calf from the herd, for a sin-offering." 20 And you have taken of its blood, and have put it on its four horns, and on the four corners of its border, and on the border round about, and have cleansed it, and purified it." 21 And you have taken the bullock of the sin-offering, and have burnt it in the appointed place of the house at the outside of the sanctuary." 22 And on the second day you do bring near a kid of the goats, a perfect one, for a sin-offering, and they have cleansed the altar, as they cleansed [it] for the bullock." 23 In your finishing cleansing, you do bring near a calf, a son of the herd, a perfect one, and a ram out of the flock, a perfect one." 24 And you have brought them near before Yahweh, and the priests have cast upon them salt, and have caused them to go up, a burnt-offering to Yahweh." 25 Seven days you do prepare a goat for a sin-offering daily, and a bullock, a son of the herd, and a ram out of the flock, perfect ones, do they prepare." 26 Seven days they purify the altar, and have cleansed it, and filled their hand." 27 And the days are completed, and it has come to pass on the eighth day, and henceforth, the priests prepare on the altar your burnt-offerings and your peace-offerings, and I have accepted you--an affirmation of the Lord Yahweh.'"
(CLV) Isa 56:7
I will bring them also to My holy mountain And make them rejoice in My house of prayer; Their ascent offerings and their sacrifices They shall offer up for acceptance on My altar, For My house shall be called a house of prayer for all peoples.
(CLV) Jer 33:18
As for the Levitical priests there shall not be cut off a man from before Me who offers up the ascent offering and fumes the approach present and offers sacrifices for all the days.
(CLV) Zch 14:20
In that day there shall be on the horse shades: Holy to Yahweh. And the pots in the house of Yahweh will be like the sprinkling bowls before the altar.
(CLV) Zch 14:21
And every pot in Jerusalem and in Judah will come to be holy to Yahweh of hosts. And all who are sacrificing will come and take of them and cook in them. And no longer shall there be a trafficker in the house of Yahweh of hosts, in that day.
(CLV) Mal 3:3
And He will sit like a refiner and a cleanser of silver. And He will cleanse the sons of Levi, and purify them like gold and like silver. And they will come to be for Yahweh, bringing close the approach present in righteousness.
(CLV) Mal 3:4
Then the approach present of Judah and Jerusalem will be congenial to Yahweh as in the days of the eon, and as in former years.
which was nailed to the cross and thrust into extinction at AD 70.
More nonsense. Scripture doesn't support that either.
(CLV) Mt 5:17
"You should not infer that I came to demolish the law or the prophets. I came not to demolish, but to fulfill.
(CLV) Mt 5:18
For verily, I am saying to you, Till heaven and earth should be passing by, one iota or one serif may by no means be passing by from the law till all should be occurring.
1 Corinthians 15:56
The sting of death is sin; and
the strength of sin is the law.
What is sin?
(CLV) 1Jn 3:4
Everyone who is doing sin is doing lawlessness also, and sin is lawlessness.
Before the Law was Given, Adam's Sin was imputed unto all, and as such Death reigned over all, regardless of whether or not people sinned...ALL were condemned... even if you did not sin, Death reigned over you.
Don't tell Enoch.
Now that Christ has fulfilled the law, there are two realities:
1) You are either IN ADAM, condemned whether you sin or not (as it was before the law)
OR
2)You are IN CHRIST, saved even though you sin.
False dichotomy.
(CLV) 1Jn 3:8
Yet he who is doing sin is of the Adversary, for from the beginning is the Adversary sinning. For this, was the Son of God manifested, that He should be annulling the acts of the Adversary.
(CLV) Mt 7:21
"Not everyone saying to Me `Lord! Lord!' will be entering into the kingdom of the heavens, but he who is doing the will of My Father Who is in the heavens.
(CLV) Mt 7:22
Many will be declaring to Me in that day, `Lord! Lord! Was it not in Your name that we prophesy, and in Your name cast out demons, and in Your name do many powerful deeds?'
(CLV) Mt 7:23
And then shall I be avowing to them that `I never knew you! Depart from Me, workers~ of LAWLESSNESS!'
Our Sins re no longer the measuring stick God uses to determine our salvation status.
Sin is now powerless to prevent anyone from Salvation.
In fact, ONLY sinners get saved.
(CLV) Hb 10:28
Anyone -repudiating Moses' LAW is dying without pity on the testimony of two or three witnesses.
(CLV) Hb 10:29
Of how much worse punishment, are you supposing, will he be counted worthy who tramples on the Son of God, and deems the blood of the covenant by which he is hallowed contaminating, and outrages the spirit of grace?