re: 'air mattress crawl'.....we too had difficulty climbing out from the comfort zone.
It's good to read of the various methods used to adapt to the same problem.
The sofa is comfortable to me when napping on it long-way front to rear of coach, while still folded up.
Unfortunately my Sweet Bride is just a bit too long to fit in the dinette as a solo bed, even angled diagonally. I was looking at moving the front dinette seat back more toward the driver seat area, only needed about 4" to work well...but that was ruled out.