Key word here "Unfortunately". And big emphasis on it.
I don't think there's any psp game I'd want over most ps1 we don't have yet.
Guess Tactics Ogre and FFT would be good additions, as well as SO2, the rest, I personally wouldn't touch for a second.
How cursed I am to like the least probable generation to be remastered.
At the very least, I hope that PS1 Classics come back with PS5.