Is it likely? No.

Possible? Honestly, I don't see why not other than the devs sort of digging their heels in on the current state of heals. Assuming we left eos and is and simply gave selene a gun I think it could work? probably wanna tweek potencies a bit, but if you were missing all the free opportunity costless healing you got from the current fairy, you'd theoretically want to actually spend your aetherflow on heals instead of energy drain, and might even need to do the occasional GCD heal, which would ideally make up some of the difference in dps. At the very least it wouldn't be as polarizing as using or not using cleric stance was, and that absolutely worked up until they removed it from the game.