New to domaining. So take it for what it´s worth:
UW chars are used.. but not that much in common language. Q even harder.
Don´t know if there is a CHIPs market for Swiss.
I would say that .ch (Swiss) extension almost exclusively make sense for Swiss people. At least limited to German speakers wanting to do something at Swiss market. (same situation on .li and .at)
Better results for .de where you got all German speaking audience under one roof.
On the other side: namebio shows almost all sales being above 1000$ with some sales not long ago.
Hope this helps. May you get other inputs too here..