Well, I’ll answer the easy bit first. Yes I could go on my own. But I would do lots of research and planning so that I have lots to keep me busy and interested. The worse thing for me would be to be at a loose end - then I would think too much and get sad.
You know the area well so you can easily do the planning etc necessary.
Driving - well we are 77 and 78 now and are very strict about only driving for 2 hours and then stopping and in our case swopping. So if I was on my own I think that I would plan to stop somewhere decent and treat myself to lunch. Quite frankly if the drive is over 100 miles I would consider an overnight stop, which we do when driving north from the south coast.
So mobility - perhaps take up something like photography so record nature and views etc rather than walk in it if you get my drift.
Just some thoughts🙂
But definitely give it a go. If you surprise yourself and enjoy it, then you E cracked the nut. If you hate it well in a way you’ve solved another problem, and don’t repeat it.
Btw, we’ve been on tours with companies like Riviera, and there is always at least one person with mobility problems. Last time in Puglia we helped a lady who was on her own as she had real difficulties and blimey what an interesting and intelligent lady she was, I struck up a real friendship and we spent the entire holiday tottering around together.