Possibly one more choice. If he never gets that leg right, you could get him warranted fit for human consumption by the vet, then dispatched and collected by your local meat collector. I've never known it done for sheep, so I don't know if the price the meat collector will pay would cover the vet callout, but we had it for cattle in similar circumstances. They don't pay the same as you'd get for the meat price in the ring, of course, but it's better than paying for the knacker to shoot and collect.