On that same note I have a little something I do for Demon Wall on Scholar. Works pretty well for PUGs or DF groups who can kill after 2nd repel but before / not long after 3rd.

Just before 2nd repel (you just finished dodging Mid Side Mid Side, and everyone is now in Mid for Repel): Pop Rouse, Fey Illumination, then Eos will use Whispering Dawn. As soon as Repel's cast bar finishes, Place Eos somewhere along the right edge and give her Sustain/Eye if possible.

What'll happen is the gnats will beeline right for her, and their AoE will be well out of range of anyone on the left side. Their AoE tends to coincide with when you would dodge left anyways, so all the better. This allows everyone else to focus on wall. If the fight drags on past 3rd repel she will probably take too much damage to keep afloat (or you'll pull hate from trying), so this is a bit more reliant on the rest of your party. That said this works flawlessly in 9/10 DF AKs I do typically.

There are other places you can do "Fairytank". Just have to get creative. Can even try this to a very limited extent on Garuda HM sisters.