Neat images.
Personal opinion: I don’t like the design. I’ve considered cobbling together a fulcrum hanging stand, and I think one would be useful. Your design seems to be aiming to solve some problems that don’t exist and introducing others.
Pressure in the ‘taint is hard on the pudendal nerve. Newer bicycle seats are designed to avoid that area. I sure wouldn’t want a PE device meant to be used for hours each day pressing there.
My biggest problem hanging fulcrum was the rod pressing in against my nut cords. That is the main reason a stand would be better than a rod on the lap. Something like a slingshot would do the trick. You’d need adjustable height. To make it fancy an adjustable diameter or radius would be nice. For example, you could hang over the equivalent of a 1/2”, 3/4” or whatever diameter rod. The fulcrum point needs some padding.
The groove you have for the CS would probably do more harm than good as far as comfort is concerned. The penis lays out flat over a rod, similar to a deflated fire hose.
The penis doesn’t need support beyond the “fulcrum” area. The edge of any extra support structure would likely press in and cause discomfort.
The best thing to do is make a prototype and try it. Any major problems will quickly become apparent.