Currently the classes a healer is allowed to dual with are:
Bard, Druid, Hierophant, Cleric, Priest/Priestess, Water Mage, Seductress
I want to make the suggestion of adding 'Monk' to that list.
When I looked at that line-up, I found it strange that "Monk" was missing, especially given the theme that the line-up had going with "Cleric, Priest, Priestess."
Flavor wise, it feels like a good fit. Monks are defensive and have no means of causing serious harm, which lines up with a Healer's aversion to killing. They dedicate their time to improving and understanding the body, which has a natural overlap with understanding how to restore a body that has been wounded. Though Monks rigorously train themselves, they do so purely for self-improvement in the search of enlightenment and equilibrium rather than a desire to destroy.
Balance wise, healing spells cannot be used on oneself while fighting, so there are no changes in that department. (Group combat is often limited to events which generally are cooperative, and/or feature Qdice, thus also would not see notable changes.)
Thoughts?
TL;DR: Healer/Monks, how bout those?