Okay, I guess I'm going with the idea of filing flats on the axle. I resisted that at first because I didn't want to end up with a special-purpose front wheel that I couldn't later put on another bike. But Shimano front axles are common enough that I can always install a new axle later if I need to use the same wheel on a different fork.

On the other hand, changing the fork slot would technically constitute a "drewing" of the frame. We're admittedly only talking about a bottom-of-the-barrel Fuji here, not a vintage Colnago, but hey, it's the principle that matters, right? I'd rather not set foot on that slippery moral slope.

In any event, it's kind of an interesting project for other reasons. I'll post some photos in a week or two, I hope.