Yes, I have often thought this.
Heaven and hell are two extremes, polar opposites. But they are not the ONLY options. I've met plenty of people who really don't fit in either of those categories. I believe God is wise enough to find appropriate options that there can be justice for everyone.
What else is there?
I think your statement about God is over the top. In your judgment, there are people who don't belong in heaven or hell and you think that God is wise enough to understand that
your judgment is the appropriate measure?
Isaiah 45:“Woe to those who quarrel with their Maker,
those who are nothing but potsherds
among the potsherds on the ground.
Does the clay say to the potter,
‘What are you making?’
Does your work say,
‘The potter has no hands’?
10 Woe to the one who says to a father,
‘What have you begotten?’
or to a mother,
‘What have you brought to birth?’ 11 “This is what the Lord says—
the Holy One of Israel, and its Maker:
Concerning things to come,
do you question me about my children,
or give me orders about the work of my hands?
12 It is I who made the earth
and created mankind on it.
Isa 29:16 You turn things upside down, as if the potter were thought to be like the clay! Shall what is formed say to the one who formed it, "You did not make me"? Can the pot say to the potter, "You know nothing"?
Romans 9:
14 What then shall we say? Is God unjust? Not at all! 15 For he says to Moses,
“
I will have mercy on whom I have mercy,
and I will have compassion on whom I have compassion.”
16 It does not, therefore, depend on human desire or effort, but on God’s mercy. 17 For Scripture says to Pharaoh: “I raised you up for this very purpose, that I might display my power in you and that my name might be proclaimed in all the earth.” 18
Therefore God has mercy on whom he wants to have mercy, and he hardens whom he wants to harden.
19 One of you will say to me:
“Then why does God still blame us? For who is able to resist his will?” 20 But who are you, a human being, to talk back to God? “Shall what is formed say to the one who formed it, ‘Why did you make me like this?’” 21 Does not the potter have the right to make out of the same lump of clay some pottery for special purposes and some for common use?