biscuit self-funding gives a few more options, for example there are care companies who will send someone in simply to be a bit of company. Presumably he's paying out of savings/income, because while he's living at home, I don't think they can take the value of the home into account.
Hospital discharge team is working for the hospital. My experience is the same as yours, a focus on getting them our asap. Be firm, say what your worries about him coping are. MN advice was to drop into conversation that you are worried about xyz and an early readmission to hospital - apparently hospitals are evaluated on that - it seemed to work for me.
If it would be helpful, you might be able to push for "reablement" at home. Basically a set of carers whose emphasis is on helping the person regain his former ability. They can be there for up to 6 weeks.
Loneliness - yes, horrible, but try not to feel guilty. You as a single person cannot possible assuage his loneliness. You might be able to find a day centre or similar that he could attend.
Must admit I found your comment about "typical of his generation" amusing - he's a wee bit older than me and a wee bit younger than my DH
- and I'm making similar comments about my own father. Maybe it's not generational, maybe determined independence is something that happens to all of us eventually.