(Cont'd)

For damage-to-healing, the idea is a rather simple one. You'd have a single target big-hit, and a linear AoE (to be further unique from the other healers) and the damage you do gets converted to healing for the drone-Linked targets. Obviously better on single target, since you'd be tanksitting with it most of the time. An interesting thought for a completely different regen is that they'd have ranged autos, and that heals the target as a pseudo-Regen - obviously weaker but technically lasting longer than WHM and AST's. Balance would be far trickier, of course, but basing it off of... WHM in comparison, the DPS abilities doing roughly 200~500 potency that you'd use every 15~30 seconds doesn't make it sound too bad especially since the idea is...

Supplementing that with the instant healing I mentioned at the start. One of the things that bothers me is the procs tied to some of the heals (WHM and AST) that merely empower their more powerful heal in some way - basically, barely rewarding and rarely used. Instead, either the damage-healing procs something to make the instant heals better, or vice versa, so it'd give a sense of a "rotation" even in the lack of having a proper one. They'd also be an obvious choice for DH, whether applying it themselves with Mix and probably slotting it in like so many WHMs do.

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TLDR Chemist could be neat as a healer that does damage to heal but has instant heals (probably potions) to supplement each other in a way that flows. I'd have suggested specific skills, but that's MUCH harder to do and prone to cheesiness.

I do love the potential idea of Meltdown being their DoT, though, with their DPS skills being based on FF6's magitech-armor lasers.