Hi there,
Here is a thread on the Forum with some Austrian beekeepers - Austrian Bee Keepers It’s not Switzerland but it’s the closest I could find!
Here is also a link to some information for wintering the Flow Hive in cold climates that may be useful - https://www.honeyflow.com/faqs/wintering-your-flow-hive/p/206#a1
Happy beekeeping,
- Cye