One trick theological ponies are a waste of time to ride on.
There are certainly scriptures available to SEMI-justify your conclusion given that your conclusion is the ONLY conclusion available, but fortunately that argument is called an argument from limited available choices, meaning that there are other avenues of understanding available that will not fit your box.
Eliminating Old Testament Laws as being FROM JESUS is impossible. One cannot SEPARATE Jesus from God without getting into severe theological fouls. Jesus IS THE WORD and the OLD TESTAMENT are GODS WORDS as quoted by the Old Testament Prophets and THE LAW.
The LAW therefore is FROM JESUS as THE WORD.
This is what Jesus said about HIS WORDS:
Matthew 24:35
Heaven and earth shall pass away, but
my words shall not pass away.
Mark 13:31
Heaven and earth shall pass away: but
my words shall not pass away.
Luke 21:33
Heaven and earth shall pass away: but
my words shall not pass away.
Any view that subscribes THE WORD of JESUS as passed away (read OLD TESTAMENT LAWS) cannot get past the facts above, therefore they are FALSE views.
1 Corinthians 10:4
And did all drink the same spiritual drink: for they drank of
that spiritual Rock that followed them: and that Rock was Christ.
enjoy!
squint