Well we won't know the diagnosis till you get it. I believe a life expectancy of 10 years is the tipping point for surgery, and 85 is the usual life expectancy of a male. So 75 tends to be the cut off for surgery. If you are incredibly healthy you may be able to push for surgery and if you are not at least reasonably healthy you probably should not have surgery.
My prostate was 57cc which is large and I had brachy (HDR) so that depends how large yours is.
35 sessions of EBRT is a lot of driving. I had 15 sessions, but I was 54 and had a motorbike. You could almost certainly access hospital transport, but I would guess that involves sitting on a minibus going around the houses for a few hours.
There are definitely EBRT treatments now with as few as six treatments twice a week. I have heard the name cyberknife, I think it is a brand name of one of these very high dose very few session treatments.
I think you need a diagnosis, then hear all the options on offer, and if you don't like them ask why the others are ruled out. If something is ruled out for a clinical reason then at least you can cross it off your list.
I consider myself lucky that most things were ruled off my list so I only had one treatment path and no choices to make.