You sure you can't just loosen up the screws on the side to the point that you can get the metal that holds it down passed the edge of the rail and just lift it off?
I have never seen a Weaver/Picatinny rail that you couldn't. How did they get the nuts on there? Normally you can actually take nuts off the threads. (The way they were assembled)
Looking at the pictures, you should be able to just unscrew the allen bolts from the base and take the side piece off and take the scope right straight off.
I know this can be done with the Armalite, UTG and Burris PEPR mounts (I have them), I would be suprised if it didn't work on the Nikon.
I would hate for you to spend money to fix a problem you might not have.