I'll be thinking about you, as I've been conned into entering my first Rally event at the end of June !
I'm in a Rally class at the moment and we're trying to wean ourselves off of treats in the ring, yet building enthusiasm for the course. What you do with your practice course is to put your ziplock bag of treats OUTSIDE the ring / course just past the finish line. Show the dog the bag, then go to the last station. Do this station and then say "let's go get our cookies !!" and race towards them. Repeat the process by backing up one more station, doing the 2 final stations, going through the finish line ...... You're essentially backchaining the entire course.
Great tip! I'll have to try that.