The part number of the Swiss keyboard seems to be MB110SM/A. I don't see it up on the Apple US Store, but the Apple UK store (apple.com/uk/thestore) has lots of foreign language keyboards listed.
Also, I'm not sure if this will help but towards the end of this year there'll be a keyboard from Art Lebedev that will allow you to display whatever legend you want on the keys. It should work with the Mac as they were demoing it with both Apple and Windows control software.