If Chemist is implemented, obviously its heals (potions and such) will be abilities, not consumables from your inventory.

You can easily add mixing in without the unnecessary inventory management, it would only deter people from the class and would be a bad move.

Lets have them balance the current set of healers before we add any-more I say, that said, I would be all for Chemist, weapons could easily be hand bombs or a small flintlock or something.