Aww - good luck. I think the best thing you can do is try to keep the wound clean and keep an antibiotic on it the best you can and try to immobilize it like Alwaysbehind said.
One thing we did with our geese (that were NOT friendly - bought them from a farmer when they were adults) when we needed to handle them and NOT get beat by their powerful wings was cut a hole in the bottom of a plastic grocery bag just big enough for their heads to get through, stick their head through and enclose their whole body in the bag - just in case she tries beating you with her wings while you attempt to immobilize her. Or have someone hold her - either way she probably won't be too happy about being handled in the state she's in. Biggest concern would be infection, however, with an open wound. If you use clean the wound and dress it, you might be able to use the "bag trick" to immobilize her wings AND have it do double duty as a "protectant" to the wound... however it could also harbor infection... not sure best course there, but a thought if covering is best?
Have you looked up "exotic animal" vets in your area - they usually treat birds. One of our baby ducks was not in good shape, coughing and vomiting (we had gotten two, as pets), so I took him to a vet (it took several calls and bad leads before I got one that treated exotics) and got him antibiotics (he had pnemonia). Look for someone who treats any birds, and they should be able to treat your turkey.
Funny part: I got the baby duck at TSC for like, $4 and some change. When the doc was deciding what med to give him, he asked "Are you planning to eat him?" Uhhh... NO! Would I really be spending $70 at the vet on a $4 duck I was going to eat when I could just go buy another $4 one and cut my losses? I'm sure it won't be cheap... $70 for one duck exam and antibiotics, but if they just use duct tape and whatnot and you can handle a deformed turkey, they can probably offer you "cheaper" options.