As long as you don't show up, set a dozen cows loose in the arena and announce you are going to practice your roping skills, I don't see why anyone would care.
My trainer is English only and when it's time to start her warmbloods.. off they go to an older, been there, done that, die-hard cowboy. It's not about the discipline, he's calm, patient and knows what he's doing. Other than the initial "Um, what IS that thing?" when an English saddle goes on for the first time, it's irrelevant that the first dozen rides were in a Western saddle or that the horse learned to stand tied to a post instead of in cross ties.