In the past, I have taken in a few birds with a similar wound/problem. A temporary solution, (as long as the bird will tolerate it) is to take a new, unused white sock. Cut off the toe, and cut down the other end some. Pull it over the bird, wrapping him/her in a mummy-like cocoon, leaving enough room for the feet and head to not be impeded by the "sleeve". It will keep the wings from spreading. Many birds will fight this, as holding their wings down is very unnatural, and counters any flight response to danger/fear/etc. Use the Aloe with this. And, remember what you are taking away from the bird (flight), so it will need extra attention. Most birds will not allow this, but some do. It is also a "treatment" for pluckers. In that case, cut holes on the sides of the sock for their wings. As I've said, most don't go for this, but, some will allow it. It might be worth a try.
Of course, common sense would tell you to cut the sock and situate it to keep their vent clear to prevent soiling the sleeve.