I picked up a complete L model wheel which arrived today
I can now report that you can swap the Hub and cush drive into the H wheel.
It requires a new hub bearing as the L axle pin is 20mm and the H is 17mm, just make sure you use an H inner sleeve too!
Was there problems with the early bikes having too much snatch like the 1st ZZR's and they modified the cush drive & hub to eliminate it?
Anyway - happy chappy
Have now started the overhaul/clean up process so once my post count is up there will be oodles of photos to show .....