I've been working on a writeup for the DNC that draws it out of THF (THF branches into NIN for DPS and DNC for healer). It doesn't really use much of what the THF gets (similar to how SCH doesn't really use much of ACN), aside from the gimmick resource idea (similar to how SCH uses Aetherflow; ability Pilfer is an off-GCD attack that provides the "Ill-gotten Gains" buff that stacks up; there's also a trait that, whenever you score a crit, you get 1 stack of Ill-gotten Gains; it's consumed for attacks like Gil Toss which gets turned into a potency 200 heal when you're a DNC).

The abilities I gave the DNC itself were relatively streamlined:

Faerie Waltz: AoE heal, potency 350, consumes TP
Kiss-kiss: Cleanse, consumes TP
Jitterbug: Increase spell and skill speed of you and all allies within 20y by 50%, 15 second duration, 60 sec CD, off-GCD
Tango Finale: cure potency 400, heal over time cure potency 50 for 18 seconds, consumes TP
Sword Dance: attack potency 300, 15 sec CD, consumes TP, grants Ill-gotten Gains

The assumption I operated off of was that either Cure or Physick would be taken as a "necessary" additional (just like the devs assume that WAR is *going* to take a bunch of surv CDs and Provoke as additionals). Maintenance healing, driven by the use of Cure and free healing through Gil Toss, would be mp based whereas burst and AoE healing would be TP based, essentially forcing the DNC to balance both resources which focus on different aspects of their healing.

The set up would provide all of the things that a healer job requires: an AoE heal (Faerie Waltz), an efficiency heal (Cure/Physick), a strong heal (Tango Finale), a fast heal (Gil Toss), and a cleanse (Kiss-kiss). It would start off without much, just like SCH, but it would grow into its entire suite (I figure Sword Dance at 45 and Jitterbug at 50, or vice versa, with the explicit heal functionality abilities gotten asap)

Kiss-kiss could feasibly be done way with if Esuna were one of the additionals given to DNC, which would open up another ability which I could see as an ability like Mage's Ballad that heals, instead (i.e. drastically increasing the baseline regeneration rate, turning it into a pseudo-percentage based heal) or debuffs the enemy. Another option would be a different Ill-gotten Gains consumer that returns some quantity of TP and MP (not explicitly *necessary* since you'd have the whole "2 resource pools* thing, but it might be required to maintain the mp pool).