Switzerland, maybe? I've been a happy migadu.com customer for years already.
Servers of migadu are in france actually
Didn't proton fold like a wet napkin when they were asked for information about their users? What I mean is: Switzerland as a whole is probably the wrong metric...
Funny enough, they mention moving to ProtonMail which is at least based out of Switzerland. It makes this whole chain a bit funny, but I don't blame the commenter for not breaking down every service the OP talked about and the OP did shorthand it to "Migrating to the EU", so fair enough.