Recently, I quite suddenly needed an alchemist NPC in my game, so I went looking for a statblock to pull. No dice. I ended up using a shaman with Craft: Alchemy from the GMG, but I felt the lack. I'm not sure what kind of book these would go in--certainly nothing that's currently on the production docket--but it would be a useful utility that I'm sure that more GMs than just myself would appreciate.
So would such a thing be possible?