Our county park was excellent about making allowances for disabled hunters. I know my uncle would take an ATV back to our stomping grounds. He would park it in a depression and get off and walk about 50yards to the deer stand. The park had a fairly complete trail system for bicycles and he was allowed to follow them. In the event he had something down he had carte blanche approval to drive to the game. If he was unable, the park maintenance workers would help him out. Those fellas were all more than happy to get out of the shop to lend a hand.
I would urge you to ask about what is available to the disabled hunter. Uncle Bill was considered a success story for the parks disabled programs. He opened their eyes to what they could be doing besides painting parking stalls blue to help outdoorsmen. If you don't bring it up they won't know their is interest.