Update:
Bay is doing great! On good weather days he gets to go outside and "help" me with yard work. I have tried a few different things for a prosthetic, but so far nothing has worked. He seems to get around just fine, but I'm still concerned about future damage to his bones.
The last time we were outside I let the rest of the chickens out to free range and whenever on of the more dominate hens or other rooster would get close to Bay he would make a low noise and come closer to me. I put my hand down and he leaned into it like "pick me up!"
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The big issue I'm having now is that he thinks he can still perch. He keeps trying to fly up onto things. I try to place him things that are high but not high enough that if he fell off he would get hurt.
He is looking good.

Yes life got challenging for him but between your care and his will to live it looks like he has good quality of life.