This is fantastic in every regard, and the only complaint I have about it comes from a selfish place of territorial healing. Witchdoctors can replace limbs, organs, eyes and junk, by sculpting them out of flesh and bone and performing a ritual to reattach them. It confers permanent RP-impacting effects on the person and I’d like to see the grafting part of this lore reflect something similar, just so that this isn’t a straight-up better alternative to it.
Again that’s just my personal bias because I’m part of the Witchdoctor team.