The very existence of dummy counters is already a game mechanic and violates reality arguments. A dummy tells you where something is hidden, but perhaps even as important it tells you where something is not hidden. The dance when it encounters a hidden object is really a minor sub-violation of reality arguments. If you wanted to stay inside gamey mechanics perhaps you could have dummy HIP, but again here someone is going to get information. If the concealed unit encountering the dummy HIP is real it stays on and the defender knows it is real, and the attacker knows he knows. To truly fix the problem you would have to get rid of dummies entirely, and that probably means a double-blind umpired game.
JR