Fitting a belt clutch drive on 650SS

I'm fitting a 30MM wide NEB belt clutch drive onto my 650SS. The unit has never been used but I bought it from a previous owner with no instructions. When I install the front pulley and then the alternator rotor onto the crankshaft the end of the crank that's threaded is flush with the outer edge of the rotor. I suspect a Commando retainer nut that has a sleeved portion that fits inside the rotor would retain the assembly if the thread pitch is good for a domi crank. If anyone that has some experience fitting a NEB assembly to a domi crank I would appreciate their comments on this issue.

I have a RGM kit on a 600 and an Atlas that uses the Commando style rotor nut.

See here:

Thank you for your reply!