I suspect you could set up a briar pipe to be the knocker that dangles and hits the metal chimes, but I highly doubt the pitch of briar pipes as the chimes would work at all.
I've got one on my roof right now. I can confirm this to be true.If you hang corncob pipes up outside your house, it wont take long till you have a huge cardboard hobo encampment in your yard. Jus sayin