We did this yesterday, or at least a version of it that I could squeeze in between a course of jumps ? As per the canter square that we did a couple of weeks ago in a test riding clinic, it really helped to get Danny into the outside rein / on the outside aids and stopped him falling through the left shoulder. He also 'sat' more in canter, so I then had to do some transitions in and out of collected canter to stop him getting stuck!
Today's new exercise looks helpful too, we've started on the simple changes so good timing for us.