Doing some searches on this and other forums seems to show that IF the profile version is dimensionally correct (except for the width of the fuse) then it should be legal to fly. Changing the fuse from a full fuse to a slab profile will not improve the aerodynamics (or the engine run) of the ship so why not. This also allows ships to do double duty at contests that have profile and classic. I think if you have a very big deal contest you could always use the fidelity points. For local contests participation is more important. I don't think we need to "certify" or "prove" that someplace in the world someone built a profile version of XX-plane. Its only a hobby.
Best, DennisT