But what about the 6502 that could be used to make awesome demoscene entries?
The 6502 is something that some of the devs would like to see come to life as well.
Is there a way I could somehow be able to contribute to the platform development? (Like by manually writing each Pascal word in assembly?)
Well, you could give it a try to simply implement it. Start by taking e.g. the Z80 backend copying it over to a 6502 directory and adjusting it piece by piece (okay, it's obviously not so simple, but one has to start somewhere, right
). And at first you don't need to deal with internal assemblers and linkers and such, simply generate assembly files that can be picked up by some 6502 assembler and then let them link together by some 6502 capable linker.