I don't see using TP to heal as being a good idea. They would need a different type of support from BRD/MCH to refill their resource pool than the other healer which would be a huge shot against them. Goad would be the only help they could get for this, which would make the duo mandatory in intense situations. If they need to sprint it would completely destroy their resources.

If the job was a melee healer, I see it working much like DRK. It would use MP to heal, and refill its MP through attacking.