Except you can't use Nanobots to eat the object if Moonknight is sitting on it.

Actually, you won't be able to use Oracle to get your DV up to 21. The ICWO bonus would be applied to the Sentinel's printed DV before it was replaced by the Man of Steel's 18 DV.

And as fecundity pointed out, you won't be able to eat the object until your figure that dropped it moves away. And he'll be moving off of hindering terrain, so he might not be making the best time to get back to your medic.