I suppose I should have posted when I 'solved' my problem :-) My LBS managed to squeeze an incredibell on the bar, by slightly shifting the grip tape, as far as I can tell. They were also cheaper than anyplace else I shopped for bells ($5.25, no shipping, and free install)

It works just fine for me, as I'm mostly using it to attempt to make pedestrians on the MUP notice me BEFORE I'm right on top of them. That said, I'm a bit judicious in using it, as I've learned that people react in weird ways. A couple of nights ago, a gaggle of pedestrians was walking about 5 abreast (and about 3-4 deep) on the Washington monument grounds, and I had to decide whether to bell them or not. I decided not to, but I'm guessing that was the wrong decision. I scooted around them easily enough, but after I passed, one of the 'moms' started yelling "Better move over dad... its a bike. Better move dad." I was about 10 feet beyond the farthest person in their group when she started yelling. Oh, and this was after dark, I was running lights front and rear, and passed at a very moderate speed.

Anywhooo... when my incredibell fails, I think I'll look at the Brass Hammer bell options, given the mounting flexibility.