Welcome!
I think it's great that you want your tech students to be prepared for theater after high school. It may be true across the board that most high schools don't have the time or the man power to help teach theater beyond acting. I know that was the case at my high school when I started stage managing. I had to take what I learned working on crew in community theater to know what a stage manager does, and bring that back to high school.
These boards have so much information - and be sure to check out the
Forms board, if you want to help your aspiring stage managers get the basics of their paperwork. As you know, stage managing in high school is far different from college, community and professional theater, but if you can give your students a strong foundation, that will so helpful in the long run.