ssh -F /dev/null [email protected]works, but this wasn't working with ssh-copy-id.
Turns out that the ssh-copy-id script is braindead and only expects one or two (with the 1st beginning with -i) arguments.
lo and behold, some single quotes did the trick:
[email protected]:~$ ssh-copy-id '-F /dev/null [email protected]'
Are you sure you want to continue connecting (yes/no)? yes
[email protected]'s password:
Now try logging into the machine, with "ssh '-F /dev/null [email protected]'", and check in: ....
tada!