Sorry I'm a bit late to the party.
I couldn't find any definitive info about potential compatible donor PCBs in your big post about a potential multi besides Zombie Raid, people are mentioning Zing Zing Zip, anything else?
Might be interested, but still looking for a clarification that I asked on another forum:
Isn't there a Namco specific IO board as well that is necessary to use it?
Hey, I am still around, and I still have the game.
I’m just surprised there’s no dump already out there for those mask roms?
Anyway I can help but it might take me a couple of weeks :)