Those are the coolest lights ever, but I would have 2 concerns:
1. Visibility of the rear light. Their rear light is meant to mount on the seat post. For a frame mounted engine, that would be ok, but with a GEBE kit the lights would be blocked by the engine (unless you are freakishly tall and your seatpost is very high.)
2. Ability to withstand motored bike shock and vibration over time. I bought a CatEye 1100, which is supposed to be a very tough light, and mounted it to the spark plug cover on the Robin/Subaru 35cc. Total failure. The engine vibration and shock of running over rough roads constantly caused the internal connections to fail, and the light only worked when the bike was not moving! I tried 3 different 1100's just to be sure it wasn't a defective unit. I ended up having to mount the CatEye on the back of my helmet, where it does work extremely well AND makes me look even cooler.
If you've already ordered these lights, maybe you can figure out a way to mount them with some shock absorbing material (like the closed cell foam used in camping mattresses). However, if that doesn't work, I will send you a free t-shirt if you attach both the front and rear Bicygnal units to your helmet and post a picture on MBc. I am not kidding.
P.S. Be careful if you do the helmet mounting, because that front signal looks pretty big and you might end up with some noggin region airfoil effect.
-Sam