Browsers support these IDN URLs just fine. You also get a non-Nordic character version of the URL automatically (punycode, looks something like wordandø.something.com”).
Things to consider:
When sharing links from the browser they might appear as their punycode on social media etc. That might look malicious to users.
Typing the URL in the browser will be hard for people not having the Nordic character on their keyboard.
When hosting email not only your server but also the server receiving your email has to support IDN URLs