Hi,
to look at it from a completely different aspect:
- have you considered Community Physio = someone who sees him at home to check which appropriate transfers/ exercises etc. he can do in his home
- he also sounds like he definitely needs OT input; all your efforts are not going to be worthwhile, if they are not transferred into ADLs/ PADLs; also OT could help with starting cognitive rehab, which will allow you to work more effectively with your client.

Good luck,
Fyzzio