Don,

A tartan backing behind the badge, instead of a cockade, is also appropriate, especially on a balmoral -- the Scottish Regiments of the British Army wore such a patch behind their badges, and the Royal Regiment of Scotland wears a swatch of Government Sett behind the new "crucified cat" badge. Glengarries tend to look better with the cockade, though, INMHO.

A cockade in livery colours and a plant badge is also very appropriate.

Regards,

Todd