S'what I had proposed for a dancer as a healer, making it similar to Forsaken World's light-specced bard. Bards in that game string together chords to make songs. These songs do different things depending on which 3 you play: light bards mainly played off "E" chords, but you had "C" and "D" chords as well. A song with the chords of "CDD" in any order (DDC, DCD, CDD) would trigger an attack buff to you and your allies.

The class and build were very viable - being the strongest AoE healers within that game. However, it took knowing the rotations very well and knowing where you could compensate didn't make light bards all that popular. Especially with a priest being easier to play, despite light bards having the only combat resurrection. It lacked single target healing (outside self) and they needed a target to trigger their skills to make songs in most cases (higher leveled ones got an AoE heal that had its cooldown reduced massively if they were light). Also, Water and Wind bards were OP in other respects (a nigh indestructible shield that gave MP back every time it suffered any type of damage and extremely potent AoE attack buff combined with tripled movement speed respectively).

I'm pretty sure something like that could absolutely work in XIV, especially coming from a game where there was a lot more out going damage and most things not being scripted. Balancing it to XIV to not out shine the other healers, or be made to appear so under-powered (like AST initially and WHM currently) would be the biggest and most consistent hurdles.