Don't even think about it!

The kilt would need to be completely unpicked, which will take an age as it needs to be done carefully.A traditional style 8 yard kilt will have the pleats on the inside of the fell cut out, which might make repleating impossible. I'm just finishing a to the stripe one and I couldn't repleat to the sett as I;ve cut out the same element each time, so it no longer exists.
It's an interesting idea, but it's just not going to work, next time order two kilts one in the sett and the other in the stripe, I know some people have several different versions in their own wardrobe.