I think that a traditional sporran with a UK would be an unusual mix. Not unacceptable, just not something I would consider. With all the pockets in a UK, a sporran, which is really just an external pocket, is superfluous. A fanny pack or other pack might work. I have found that the problem with the UK is that the apron is so narrow, that is tends to blow up easier. However, the way it is made, there are more layers of material than in a trad and I have never had a problem with anything showing. I was concerned something might, but it never did.