I have used a similar (but not as neat) arrangement with two lights (but that does need two cords). One work light is plugged into the CT and the other into a regular socket. I created a couple of 3 wire extension cords of the right length to use on the boom arm and one of those, plus the 6' cord of the clip-on work lights gives me the 'remote start' facility for close up use. I just use a regular extension cord for the other light(s). In dark places one usually needs more than one light anyway.
However, I often find that a single hose is just not long enough so I bought some connectors enabling me to join several hose lengths when I need them. Yes some disassembly and assembly of hose connections is required and I always use the larger hoses closest to the CT. Then I need to use regular long extension cords. Hint, Velcro tie the hoses and cords together and have a small flashlight in your pocket. Once (in pre-Festool days) I had the utility power go off whilst I was working in the deepest part of a roof space!
As an aside, other hoses fit the CT range and I have seen some inexpensive (no-name brand) long (20' +) large diameter hoses that would work for this kind of cleanup. But given the choice I am not sure if I would want to use my CT (and bags) for some of the cleanup jobs that are involved in, er, dark places. I have one of the special vac 'tops' for a 5 gallon bucket that I could put in the line, but I've not actually tried it with the CT.
I have a roof crawlspace job coming up and I had been wondering about using the CT and boom arm. It actually helps by keeping the cables and hoses off the floor for other jobs providing one takes care over the balance. This thread, like many others, certainly gets the creative thoughts going.
As regards the original idea. Rather than have the light and switch integrated into the actual nozzle just have a short length of tube to go between the various hoses and nozzles, with a handle, lights, switch and, gasp, a plug-it connection for the light(s). Plug the hose (of any standard size) in one end and the nozzle or wands on the other. In fact adapting the bent wand (D 36 HR) that fits most of the hoses and nozzles would do the trick and be easier on the hands. (I would add a retaining clip to stop the annoying habit of the hose falling off!)
SteveD
Maybe a Kapex? Hah, hah, hah!!
