Hi there, I had an Imperial and didn't like it because it was to wide. I also didn't like the lacing it rub my inner things and was annoying to me. So I found an old Brooks pro and chopped it and made flaps like a Brooks swallow and used zip ties to pull the flaps together. It worked great. I don't think you have enough side skirt to to cut down though. I liked the two suggestions above mount the seat where you like it. Then use a drill to put the holes in and use a shoe lace to lace it up but use that closure someone mentioned so you can vary the tension.
Have fun.