I'm going to preface this by stating my knowledge of the original Chemist class is limited to the wiki, so I might miss the mark, but if it were up to me, I would expand the abilities beyond the traditional apothecary-style mixer and make it a full combat medic, and base it out of Garlemald (due to their combat training and aversion to magic).
To further differentiate them from the other healers, I would have them be a healer that fights in melee using knives or revolvers/pistols and they use bandages, poultices, and tonics to heal instead of magic.
Since the mixing mechanic is integral to the class, I would do it similar to a mudra system, where you're given 3-4 "ingredients" to mix, and those can translate to different party buffs, such as dps increase, damage reduction, or even a movement speed increase.
anyways, just a thought![]()