An actual PS1 release is basically not possible.
Brian Provinciano basically started writing RCR as an NES port of GTA3, so from the beginning he had portability and old hardware in mind.
I am using the unity engine, which is portable for modern consoles, and I do plan eventually to release on consoles, but is not straightforward to port to older hardware. My sort of ultimate goal here is a modern console release (Switch, PS4/5, Xbox One/Series Whatever), but that is contingent on budget, on time, and some other factors. I'll try my hardest to make that happen though.
The only thing I can really promise at this point is that I will continue working on the PC / Mac / Linux versions, with eventual console releases as the target.
I have never released a game on consoles before and there's a whole lot of paperwork and beaurocracy I have to deal with to get there, which I plan to do.
Gotta finish the game first though!
Thanks for your support and engaging with the game!! Let me know if you have any questions or anything like that, and please let me know what you think when you get a chance to play!!
<3 Daff