Probably another stupid question: But it seems I cannot select any iOS devices for the emulator? It is greyed out.
Did you added iOS to the targets first? In the same toolbar
Aha you might want to start up Xcode and check defined emulator targets there first.
I think those had to be activated first and your Apple account activated in Xcode
Unfortunately I am not smart enough to know how to do that. 
Out of my head I think it is in the Xcode menu somewhere but you should look it up
Can’t even get xCode to open without having to set up a full project. I went through all the menus. Even though I still have my active Apple Developer Account its been probably 5 years since I opened xCode. I don’t even know what to search for.
If you check the iOS deployment guide:
https://cordova.apache.org/docs/en/5.0.0/guide/platforms/ios/index.html
It states:
