The best I can do for you is tell you that when City played away in switzerland at lausanne, we had no trouble with flags and drums (or was it bodhrans ).
I've seen a few games in switzerland and Drums, large Flags and even flares are common place, i wouldn't forsee a problem, in general the swiss are laid back, understand the difference between a drumstick and a weapon and as long as you look like you can control what you bring in (i.e. aren't steaming drunk) you won't have a problem.
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