Not 100% what I'm saying. I'm saying that if Switzerland holds a lot of Germanys gold and has promised to give access whenever and don't hold up to that promise, Germany just moving some tanks over, then taking the gold, then moving the tanks back, is quite a possible scenario.

Yes that would harm the EU in short term (1-5 years). But so would it get hurt if a powerful member of that alliance is not able to enforce rightful demands. Anyways if we include the EU into the discussion, it's very likely that a lot of other steps would convince Switzerland before the first tank needs to get manned.