This doesn't really work. Knowledge (any one) is trained only, and Craft (alchemy) can only be used by casters (possibly even only arcane casters, I can't remember)
And I support both the price drop and change in healing. d4 in a day REALLY isn't much. I'd sooner pay the temple cleric to heal me NOW. And with that, if you're trying to open healing up to commoners and level one adventurers, 11 gp is prohibitively expensive. I can get a battleaxe for about the same price. Most commoners don't even make more than a few sp/day if they're lucky. No one's going to spend a third of a year's wage on a single healing item