If reveloution only spreads on the skin and oil glands im not sure if it would work on depluming mites. Ivomec is absorbed through the skin into the bloodstream which is what i read was needed to get to those mites. I would try treating for favus first. Ivomec can be hard on a weak chicken.
I thought feathers lost their blood supply after a certain point? Depluming mites are hard to reach while in the feather, but they have to move across the skin to find a new feather to inhabit.