I very recently set out to start bringing my vimrc with me when logging into remote hosts and came up with this.

  Host * !github.com
    RemoteCommand echo -e "syntax enable\nset ts=2\nset sw=2\n" > ~/.tmp_vimrc && bash -c 'set -a; vi() { vim -u ~/.tmp_vimrc "$@"; }; set +a;bash -l'
    RequestTTY yes

It gets ugly when you get a lot of options in there.

It's possible to just curl or scp something in place via RemoteCommand above, or `source: https://foo.io/vimrc` but my security paranoia lead me to this instead.