Larry -- I am delighted to hear you are able to get away with this. My first thought was that when you spread the deck, if the spectator finds their card, they can't help but notice if you cut the deck right at that point. If they don't, that's good to know.
I wonder: Do you think you could stick the Ambitious Card cleanly into the middle of the deck, then spread the deck to show the card in the middle, then do the move, snap your fingers, and show it on top? Would that fly?
I can't wait to see what this move has to do with the trick.