Try taking your calcium supplements and grind them to powder, and just add tiny sprinkle to a large enough breakfast that it's disapated enough he can't smell or taste it
Awe poor guy,,some people are ignorant and think it's funny to just ignore them and run them over deliberately,,,I would suggest taking to a vet for x-rays for broken bones or internal injuries
The bowl looks too deep and slippery,,and from what I see others have is water away from his house, use one those other shallow bowls u got there, and his house should be opposite of the basking light so he can get away if he wants from it, hope this might help
What about a outdoor enclosure. ,how deep should I build underground barriers so they can't tunnel out?I see a guy just lost his, look like sulculta,,,