You don't want to make the effort to memorize a chart with at most a dozen entries... but you have time to make a database to handle all combat.
Combat Luck.
No, I mean by dodging or blocking when someone takes a swing at you.
None of the characters I ran ever had a facial scar either. It's funny, but all my characters really didn't scar up much at all, even on those freak occasions when they did get hit in 3-5. Unless I thought it would look cool, anyway.
Again, you sound like you're deathly afraid of having your heroes get hit in the face in combat. To reiterate: it rarely happens, and if it does happen, so what? Hit locations do not force you to model gangrene and facial reconstruction.
It all comes down to what's more fun to play, actually. Having a leg wound is more interesting to me than a hit point countdown. The possibility of sudden death is more interesting than wading into combat secure in the knowledge that I can take two solid hits from this guy's shortsword before I risk negative body.
IMO what you have is a hit point system that takes longer. It has all of the drawbacks of hit locations and none of the benefits.