While I was contemplating my dusty cassette, Tim requested a little more information on my Edelux/rack set-up. Turns out his request fits nicely with my details theme.
Basically, I'm using a Rivendell "Mark's Rack" up front, which has a flat tab on the front. This rack is more than it needs to be to function simply as a front rack, but versatility is its main attraction. I've used it as a front and rear rack on multiple bikes. That tab, with a simple "L" bracket from the hardware store, made mounting the Edelux quite easy.
Because the light is somewhat cantilevered out beyond the mounting screw, I was concerned about rough roads and extensive gravel vibration. I figured that the light would loosen and rotate forward, and I'd be continually adjusting the aim of the light. Fortunately, it has stayed in place so far. Compared with the prior fork-mounted configuration, this is fantastic. No wheel shadows.
Now that I've been reminded how well this works, I think I'll schedule a ride for tonight.