Sorry to hear of all your hatchlings' troubles. That would be very hard.
I was curious why everyone thought the snake should be put down? I'm assuming it was placental tissue emerging from the deformed region. Can a vet not treat something like that? If so, and if the animal was active and behaving normally, why not give it a chance? Assuming that it could eat and defecate without problems, it could make a very nice pet. Granted it would not move normally, but so what? A vet might even have been able to cut the fused tissue to restore range of motion, like when babies are born with two fused fingers and the "webbing" is cut to separate them.
I might get yelled at for having suggested any of this, but a snake behaving normally doesn't sound like it's in very much pain, although it would have to be closely watched for any signs to the contrary. Why not take an animal like that to the vet to see if she/he thinks they can heal the exposed tissue and go from there? Is it purely cost, or hassle, or has experience told people that these snakes never make it no matter what is done?