What if I told them, hey, you guys, find out about Krashen, Cummins, and/or Swain, and then tell us? then we workshop. Then we do some activity. I can reasonably be "the teacher" in that kind of environment. More like a coach than an instructor.
See, I don't know pedagogy. I'll look it up, but I don't want to start acting like I can give instruction on it. Ideally, if there were practical activities plus periods of reflection and self-assessment, then I could be the overseer. It'd make sense then to have roped me in and I could use some of my many years experience as a guide (which I'd make available for critical inspection too).
Basically, I can't be the instructor. But I could try out being the flashy workshop guru. Is that still teaching teachers to teach?