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Lets just say someone wanted to do something similar to a hurdy gurdy, with a wheel and stuff. If you just rosin up the wood itself will it work? I had a thought that you'd have to put horse hair on the wheel to make it like a violin bow or something, but research says that hurdy gurdy's themselves are just rosin'ed wheels. No idea.

but something cool should come from this

Dude, we have similar secret project ideas here
I believe that if the wheel is sanded enough, the rosin may not be required. But it probably won't hurt to rosin the wheel itself. I was thinking that it might be worth a shot to cover the wheel in a type of material to grab the strings as well.