Unbirth should mostly just need alternate animations for "swallowing" and "regurgitating", so it's pretty doable - that said, I'm focusing first on non-sexual vore for the game (so mostly oral with a few special exceptions for things that can consume multiple ways, like a slime enemy that can absorb Mia). If mods/modders wanted to add alternate forms of vore in the meantime though it should be fairly easy.