Welcome to the forum, YinYanger.
From my experience with my own GPEH, I would recommend getting the surgery. Having the stomach in the chest is dangerous. It can twist, and then that's it. I could feel my stomach trying to roll when I turned over in bed. You've done the right thing in getting more opinions. Since they seem to agree, I, personally, would have to trust them.
I was a bit over 60 with my Toupet. I was not in great shape because my stomach was shoved into my chest by a wreck and I had other injuries. The operation is more involved than the ordinary Nissen because of having to pull down the stomach, but it's done regularly and generally successful.
I'm not sure WHY they won't just pull down your stomach. Maybe because it will be hanging around loose after freeing up the esophagus to make it long enough to stay below the diaphragm.
As for gas bloat - I had it for a few months, but it went away. I regained my ability to burp because of having the partial wrap (Toupet). I can't vomit though. I felt all along that the surgeon got the wrap just right, even though one young resident wanted to do a dilation. (Don't allow that unless it's absolutely.) I still eat gassy veggies with caution, but am eating more all the time. Mostly, I can eat anything now that I could eat before the surgery.
You are right that this serious a surgery will take time to heal. At least in my case it was a good thing to have done.