No ewbish, you cant. Not according to the NYS DOT/DMV. If the bike says "for off road use only" it cannot be plated. ever. period. No matter what you do to it, or if you have it pre-registered in another state. I explored the option of an "R" which is what I initially wanted, but it wont happen in this state. I tried to buy one pre-plated in a neighboring state to get transferred into NY, DMV shut me down.
Except that they can't really stop you, violates federal laws. CA tried this, and lost a class action suit years ago. It would be akin to a state not recognizing a wedding license from another state. If you show up at NY DOT w/ a XR650 plated in AZ, and it meets NY's safety requirements, they have no choice but to license it. There are a couple of states that make this difficult, WA, IA, etc. For NY residents, it is recommended to get your bike licensed in Vermont.
This is really common BTW, and I see it a lot. AZ is the easiest state in the US to get a offroad bike street legaled. In fact, on many dealers floors, at least 1/2 the XR's and CRF's have Baja Designs
kits on them. You buy the bike, take your title to a 3rd party DMV office, pay 14.00, and get your registration, tag, and valid plate. No inspection. I've know folks from all over the US that come here, get a PO box, buy the bike, get it street legaled, then trailer it back home. Besides, you can always use the Reconstructed Vehicle Title laws, this works anywhere. RVT is the methond you use to get a custom or home built bike legalized. You customize your XR frame in such a manner as to require a new VIN be issued.
Trust me my friend, I've been plating bikes for years, every state has a way around.
I currently own the following street legaled bikes: CR125, XR250R, KEF300 (4-wheeler), RM80, CR80.
The nice thing about a plated bike is, the FS and BLM can no longer **** with you. They have to treat you the same as somebody in a minivan.