Is there any particular reason you don’t want to order from a UK retailer?
I order from Blackwells frequently. Free shipping to Switzerland. Never had a problem.
ETA:
Alternatively, a bricks-and-mortar bookshop in Zürich specializing in English language books is Pile Of Books.
If the book is very ‘curious’ perhaps they would not have it in stock, but on occasion the owner has been able to track down some pretty niche titles for me. Perhaps worth a phone call to see if he could help.
I made the switch to ebooks about 15 years ago and could not be happier. Yes it takes some getting used to, but once your brain gets over the lack of paper you quickly adapt. The clear upside is that you can get any book instantly, an with the Kindle Scribe and Remarkable you can even annotate with a pen, look up words etc..