Just FYI for those who are interested: One has to provide in writing (letter, fax, or email) a statement that you want your points transferred to non-resident status, along with your sportsman's ID, DOB, and new address and NDOW will take care of it.
To do this you can call the NDOW office and ask for Julie Meadows. She is the point person for this. Her email is
jmeadows@ndow.org