The rag joint set up should work fine on that wheel, I've got a wheel with the very large spokes and the rag joint works fine on it, it is a bit tighter between the spoke but it mounted good on it.
There is no way you would ever get a clam shell sprocket hub to work on a wheel with a 5/8" dia hub, there isnt enough surface for it to clamp too in order for it to be secure and not slip/rotate on the hub.
Originally Posted by HT2005
Any sprocket adapters to fit a 5/8" cylinder- shaped hub? Anyone?