With the amount of work you are talking about you might as well build an entire bike..you could just buy a moped...
After all that, what's the likely hood that the state patrol will call it a moped after inspection..
The Vin is going to be tied to a motorcycle. I just don't see the point....
Or, just get a MC lisence,what is it? Like $100 bucks for the exam and you just bring the slip to the DMV. boom, ride whatcha want.