..well, a few days with my bell in my commuter.
So far, the experiment has failed. Peds seem to ignore the bell as much as "On your left" (or "Passing on your left" or "Hi, I'm coming up behind you!" or any myriad other phrases I'll call out). Of course, folks with earbuds crammed in their ears can't hear anything, so it's all rather pointless. Just extra care and slow speed around peds seems to do the trick.