Cygolite works on my Volpe, with cross levers…takes some work to get it mounted (fits over the very end of the bar tape, over the electrical tape), but it fits well enough. I actually replaced the Cygolite with a Cateye, and the Cateye mounting system works much better on my bars, but isn’t as easy to move from bike to bike.
Velcro is your friend ( well mine anyway ). A foot or two of non-adhesive grab itself velcro is a marvelous thing to have on a bike, weighs nothing, takes up no space and saves your assorted stuff and body parts when needed. Duct tape without the goo.