More incentive to eat random transformation items, or the option to have a chance of enemies force feeding you one after losing a fight.
What sort of "incentive" would you include? If you get off on that, do it yourself. It's a bad idea to include some kind of incentive to eating random shit, because that indirectly penalizes the ones who *don't*, which is a good chunk of people who don't want to look like some unholy tentacle beast or whatever.
And I can guarantee you that being force-fed TFs after losing a fight is not going to happen, because that's an awful idea. It would only encourage save-scumming from everyone who wants their people to be a specific way, which is a lot of us.