It seems like they could still demonstrate the procedure they'd use for teaching, if only for an unrelated topic, and some of that could be transferred. I expect it would be more efficient than trying to reconstruct the syllabus-building techniques (&c) separately.

There are also teachers who train other teachers, presumably, so you could employ the help of one of them.

How does it work instead? I don't know much about this and your response doesn't seem to explain why you think that or what you think happens instead.