shadows makes me nutz. spent a long time eliminating mine a cpl yrs ago. I was toying with the idea of a headtube mount, but never worked it out. I see you have a brake cable right in front of the headtube, but I'd bet someone really cleaver could raise that light, mounting it to the headtube, with some kind of accommodation for that brake cable

something like this but with a bigger diameter for the headtube & some kind of reach-around to get around that cable