I personally would love the class! Been wanting it for a while. I always imagined that since Uldah doesn't have a healer there that something akin to and alchemist/chemist would make sense. Heck, instead of using items they could trap or build ather in vials that they mix to apply cures and/or buffs/debuffs. MP could just be considered a resource in the sense that it's the aether the chemist has captured into his/her ather extraction device. With us likely going to Garlean territory a rogue faction trying to break away from the Empire as refugees could escape to Ul'dah and teach the player how their tech works. This works perfectly with the lore imo because it's just a branch of magitek technology. For weapons I would prefer a pistol but we would likely get a melee weapon to keep us on par with other healers reach.
-Keyo