Can you get to the stern OK?
I figured out how to mount at the stern easily when I had an injured shoulder: 1) slide aft & get between the stern and the tiller crossbar while the boat is stalled to weather. (You can steer it up that way too) 2) Get one foot up on the deck while facing DOWNWARD. 3)reach way up onto the tramp and grab the hiking strap with the closest arm to the boat, because THAT ELBOW IS UP. 4) Now POWER body up & over the rear crossbar because you lift by using the muscles on the FRONT of your leg, and your arm is bent the correct way for good strength. You don't even need both legs on the stern hull, just one leg.

Its even good for fatboys! Try it on a nice day.

NOTE: Doing this facing UP does not work because you have to use hamstrings, and your elbow cannot bend the wrong way= no strength.