There’s no way to choose a TR plan, I only get a “Restart Membership” button which gives me the Swiss prices 
Did you do this recently or did they maybe fix the loophole?
EDIT: So the Netflix Helpcenter article says if you want to move a country, you should cancel, wait for your payment period to end and then sign-up from the new country after that. I’ll wait now for a bit to see if the plan activation flow is different if the account is completely cancelled.