I think I'd try that, and see how it works out. Do you have any cages or dog crates or anything?
How does it look? is there any swelling or anything on the straight part of the leg? Many years ago, a friend had an Aracauna roo she was very attached to, and he broke a leg, just above the foot. She wanted to try fixing him. He also had a sore near the break that was infected. She speculated that maybe he'd gotten stepped on by one of her horses. We cleaned the wound with peroxide, put an herbal disinfectant on it and rubbed it with arnica gel. I put a drawing salve on gauze pads to draw out the infection. I tried to set the bone, but wasn't able to. So I padded the leg, and splinted it with popsicle sticks, wrapped in vet-wrap, that stretchy bandage that sticks to itself. I went over and changed the bandage and put on fresh ointments and arnica gel everyday for about a week. He healed, to my surprise, and lived a good many more years, and got around just fine.
If you can't locate the injury, and it doesn't get better with a couple of days isolation and rest, I'd go ahead and butcher him. Just so he's not suffering. Good luck!
