Just save your WIP then reload the file ? That works just fine as far as “undo” is concerned, because undoing just one choice is pretty run-of-the-mill once you’re used to the soft. You just have to change one toggle. 🙂 Just my perspective of course. 🙂
Reset is even easier : create a new character from scratch and there you are – you’ve got the base model. 😉
To be honest I’m not sure I understand your request. Could be the team will have a better grasp of it. 🙂