Well, just goes to show you should read before fettling...
Having just finished a dyno hub wheel build (thanks Santa) I tried to wire two of these together to test the wheel, looks like after much failing I seem to have made a small amount of smoke and killed one of my torches, ho hum.
On the basis it was broken I took it apart to see how it worked, now with batteries its very dim, only just on, so took the lower PCB off and just wired in the emitter in, in for a penny.
Seems that this works okay is just bodged into the hub, very draggy but plenty light comes out the front, may work at a back up/get you home for the Cyo when it arrives.
Rather than use the barrel, I've gone for half an wine cork, with the wire pushed down the middle, should make is all waterproof.