I say start simple. Take whatever they currently ride, lose the "quack stance" and get them into positive/positive angles. As simple as taking the guy/gal with +15/-15 to +21/+12. It's the easiest way to change the mindset without even removing bindings. Just have them try it for a couple runs. This season, I have a date with several level 1/2 instructors to do just this. No boots, no boards. Run what you brung