Kevin,
I've been wanting to add them to my 5.2 as well. My concern about their setup is the leeward carabiner is dragging in the water and slapping against the hull. This may be OK for a leased boat but I wouldn't want this on my personal boat.
My thought was to take a line and tie a series of loops in it where I might trapeze and leave the carabiner on the dogbone all the time. Grab the line and find the loop closest and hook it in the beaner. I do like the climbing knot though - might do that instead of the loops but still leave the carbiner on the dogbone.