Just put the shirt over her wings?
I think you have done a nice job with the bandana and non stick pad, if that's working, then that's what I'd stay with.Tonight my daughter and I did make a bandana covering with a nonstick bandage under it as she was constantly pecking at her open wound. Tomorrow I also have the Vetrcyn spray arriving and also have been feeding her herbs and berries I grow that are great for inflammation. I'm starting to wonder if she is in so much pain she can't poop but if she was in so much pain would she be able to peck at her wound
If you find that she is able to remove the bandana, then try the t-shirt. Put is on her, you may have to open the sleeves up a little more, but the extra material makes it harder for them to get at the wounds sometimes.
Vetericyn is good, but you really want to keep the wound fairly covered with ointment so it doesn't dry out. Did the Vet give you any silver sulfadiazine? If not, then I'd use triple antibiotic ointment on the wound(s).
All of your ladies are just lovely, I'm so sorry that you've had to go through this and them too.