Since it's you Kell, might I suggest Naberius for the fast healing along with Body Fuel as a feat?
Whether or not it's entirely kosher I'm not sure. But it can be argued it's a natural healing process only acting a lot quicker.
That would mean a PP-recharge mechanic.
I wouldn't allow it personally, but you're a Black Hat so it's up your alley
First thing that comes to mind, if I come up with something else I'll get back to you.