Well, I can't completely confirm if those kinds of kinks would appear in the game or not. Apologies if my previous comment gave you the false impression, but I more so meant to say that those kinds of kinks aren't off the table, not that they'd be included for sure. As for how we would implement them if so... well, don't get your hopes up for 'vore mechanics'. It would probably just be vore scenes, as part of the enemy grapple sequence.
Wish I could somehow recommend some kind of vore game to you instead, since it seems you're really pining for one. Unfortunately, they're not really something I'm knowledgeable on. I apologise, but I wouldn't get your hopes too high for GROVE being a 'vore game'. At most, it'll be an RPG with a rare vore scene, rather than one that has mechanics around it or makes it a focus.