We had something like the Xcell for my dad. And a hospice worker provided by Medicare. It was 3 days a week for a couple hours a day. They bathed, turned, etc.
The rest of the time I was fortunate to be able to move in for a while and help out. He was at least capable of getting up and into a wheelchair so the bedsore problem was limited.
What about looking for a qualified individual, rather than a company, willing to live for just room and board?