If you were to go into the traiteffects.txt file and change the VampHeal_Type modifier to Duration 1%, that would speed up the healing process to almost instantanous.
As far as "Push the button and boom, you got full health" I'm not sure how to do that.
You could make Bloodheal mimic a Blood Bag effect so it fills up super fast that way, but the way above would probably be alot easier.