I took a two day ISF course and it was with Joel. I think what I would do if I was in Spectracal shoes would be to offer a enthusiasts course. Spend a lot of time with the C6 and the the Display 3 and do more practical work. I would offer the course and give the students all the reading material and course work online or mail them what they need to read. Then I would set up systems where its almost all hands on for a day and a half. Set up situations where they will get confused and learn hands on. Use different screens and show how making mistakes on the set up will affect results.
Just a thought but the 2 day course I took was kind of worthless. Too beginner and I could see that the testing was deficient and the designation didnt mean much.