Here is my version of a patch in place of a pin on a kilt. I only do this for athletic purposes because although I want to wear a pin, I don't want a pin to get in the way or cause injury during the sport.

If you want to decorate a kilt with something non-traditional, I say do it, and wear it with pride!
"When I wear my Kilt, God looks down with pride and the Devil looks up with envy." --Unknown
Proud Chief of Clan Bacon. You know you want some!