It's lovely, and I think it's as good as meshing those two concepts are going to get without losing some from one or the other.

The option for a quacksalver to function as a secondary healer along the lines of a bard, witch or paladin would help the shadewright and archetypes mesh into groups a little better. They don't have strong dedicated healing, but my concern is more with the ability to use actual magical healing which would stop certain effects that merely granting temporary hit points don't (ie. bleed).