I'm wondering what the problem even is. I mean, can't you just put all the stuff relevant to 32 bit gaming into a 'retro-gaming' package and be like "there, now if you want updates, better find maintainers"?

If you have an old game, chances are you won't need many new features. Only problem could be other packages or the kernel becoming incompatible. I don't know how relevant that is in this instance.