Again, the "What's-Your-Threat-Model" thinking applies. It's at least debatable if one manages to create a complete threat model, let alone think outside the box as attackers do.
However, *if* one manages to create a complete threat model, it's not necessary to think like an attacker - or, to put it the other way round, the attacker way of thinking is just part of your own complete assessment.
I highly doubt the ability of man to create anything in a "complete", 100% way.
I don't know how bills are printed these days, but wouldn't they need more than a special press to duplicate another country's currency? What about the particular inks, the particular paper? And what about the plates, wouldn't they need perfect copies of the plates used to press the U.S. bills? How would they get those, would they just photograph American money, or would they need copies of the actual plates used in the U.S.?