I like the design option people mentioned earlier.
Could make a skill like continuation that triggers if you meet certain conditions like
heal x% amount with a single target cure to trigger an earth spell that places a damage down on the enemy or
use an aoe healing skill that triggers a wind spell that places a dot
and something like mitigate % damage via Aquaveil/divine benison to trigger a water attack spell that splashes around the enemy that heals allies around the target
that way at least you wouldn't feel as bad to use your gcd healing on white mage (which imo is quite a waste of design choice to begin with) but you'd get compensation like the blood lily