How about:XX00 = Prototype/Testbed for XXth series of Starship (Often placed into service after testing is complete); XX01 = First production model.
It's possible. Then again we do have NCC-2000 USS Excelsior. The lead ship of the Excelsior Class, IIRC.
Which started out as a testbed/prototype for a new class of ship equipped with "TransWarp" drive. I don't think its ever been said on screen, but its been speculated that her original registry - NX-2000 - was an indication of her eXperimental status. NCC-1700 could have initially been NX-1700 and was later commissioned as NCC-1700 after NCC-1701 had been launched.
"Canon is only important to certain people because they have to cling to their knowledge of the minutiae. Open your mind! Be a Star Trek fan and open your mind and say, 'Where does Star Trek want to take me now'." - Leonard Nimoy