Fun in the Sun had some Goodall harnesses that looked like they would be comfortable. Anyone seen/used those?
I do not know about you but lacing a strap across my nuts is the definition of UNcomfortable. My first Hobie harness was that way and was about enough to send me to mono-hulls.
Try a real full harness (one with leg straps) if you get fatigued. The fatigue issue I always had was no so much from the trap position in long distance stuff, but getting uncomfortable looking constantly in the same direction. It is worse in light air when not on the tramp as you typically are sitting awkwardly, looking up at extreme angles and tense from willing your boat to move that little bit faster so you can get out on the trap to relax.
If you have wings and a trap system, you gain no advantage in ease. If you do not have a trap, then you will end up hiking, and if you have spent any amount of time trying to hike with your current straps, you will agree trapping is way the better way to go.