I've got one as well though I think it's a bit big to hang off your keys.
Just to let you know I attempted to shorten the keyring today. It's very easy to do, mines now the same length as the key and still shows the full effect of the tartan, if you do try it take note of how much goes into the metal clip it's more than you think.
(only need a tiny screw drive and a pair of scissors)