Blackwarder
Adventurer
Um, no
HP and healing determine the pace and feel of the whole game, particularly whether the game is combat as war or combat as sport. You can't just slap together something at the last minute and call it good design, or add in some arbitrary modularity without addressing how HP and healing affect everything else.
I respectfully disagree with your premise, as we've seen in the previous packets it's fairly easy to dial the healing mechanic up or down be adjusting the rate of HD recovery and HP recovery, from full recovery with a short rest on one extreme to 1hp/day recovery on a long rest.
Things like healing surges and such should be part of a rules modules and would allow you to change the nature of the game.
Warder