Do you teach hunt seat or dressage? I think, now just me thinkin', that you should give these western riders some dressage lessons. It would benefit them SOO much and I bet they'd just love it! They even have Western dressage competitions, or so I've heard. Since they are still riding direct rein, then it's perfect! Work on good transitions, shoulder in, getting a good tracking up at the trot, good backing up. Teach them how to post, just so they will know it.
You could even have them work toward a cute little "western dressage" show at your barn. It would be a hoot!