Lots of kite schools use Headzone Helmets for teaching, a few surf schools use them as well. As well as protecting the head, they are invaluable for teaching, Instructors can communicate with students, be it in the surf or on flat water.
I wouldn't teach without them, better for everyone, student and instructor,
Surf riding has many things things that are can be taught eg Crash your kite in the surf impact zone and getting it relaunched or getting to the shore with your kite not trashed by the waves.
Learning from someone elses EXPERIENCE is what its all about.
Ben Wilsons surf Clinics will be of good value to anybody who is interested in this style of riding, If I had the money to spare i would like to go myself.
Richard T