I like the idea, but have seen no support in the scripture, I haven’t found any support that you will have a chance to change your mind after the ‘first death’ which is death of the physical body.
Not that Satan is forced to do evil, but that’s what he chooses to do and he chooses how to do those things (within the framework that God allows him to operate.). There is no benefit for him to do anything else - God has already passed judgment. What would happen of Satan just ‘turned good’, not much for him, I suspect that he too has no way to repay God for his ‘sins’
Do you accept the unjustness to a child of parents deciding that it would be good to move to red china?
Perhaps, but that would require some satanic order of ‘humans’, now your getting into secret orders of witches and the like, a fundamental difference between humans created by God and by Satan. But against what you posted, I suspect that the weeds are mainly referring to demons.
My direct answer to your question is - to my understanding it would be unjust to save all the people.
Re: the good Samaritan, Jesus uses that to show who are your neighbors (the beat up man is a neighbor to the Samaritan). So you know who to love as stated in the 2nd commandment, but the first one takes priority - love they God.
So the way I read it is Jesus said Love thy God with everything you got, that will lead you to loving thy neighbor. So again it’s your beleive and love for God that is the condition (just belief alone doesn’t cut it ‘as even the demons know God and shutter’.
That is a good one for your point about works alone can get you into heaven, but also a good one for eternal punishment. But the sheep are ‘blessed’. Blessed is a special term and means a lot more then we commonly think of. this comes about following God’s commandments (see Deuteronomy 28), which again is 1 - Love God, 2 Love Neighbor. The opposite of Blessed is cursed and comes from disobeadiace to God’s commandments. So the sheep are blessed and have followed the commandments 1 & 2, which means they know and beleive in God, the goats are cursed and disobey this.
I’m not saying deeds are unimportant, but belief and acceptance of Christ is primary.