I find that if I ting my bell well in advance, when I'm still quite a long way away, as long as people hear it, when they look round they realise that I'm so far away that I'm tinging to announce my presence rather than to barge past them. Of course, not everybody hears. Maybe I should have a troop of semi-naked well-oiled men with trumpets heralding my presence instead.
I do like the idea of cowbells or something similar. I might just have a look on amazon and see what there is. People hear me coming on the Innocent in the morning anyway because I'm generally "singing" along with whatever's on my mp3 player, unless I know that there's somebody near enough to hear me. I wouldn't deliberately inflict that on anyone. I generally have my mp3 player set to "random" so my soundtrack is very eclectic.