You'd be good to check the laws forum for California law. Plenty of people in CA have provided details there, and their experiences with the courts. All the vehicle codes you're looking for are already there. I seem to recall reading that you do need a license, and a DOT helmet. I forget about registration.
I'm trying to see in the pictures the sleeve you're talking about. I must be missing it, but I think I know what you're talking about. I know that some of the engines come with a bent clutch arm, to deal with that wear point. Some people have fabricated a pulley bit mounted at the clutch cover which accomplishes the same thing, and makes for an easy pull on the clutch.
Nice bike, insane bars.