Thanks. I appreciate the idea and actually gave it a try with a homemade one a while back. I decided that a "quarterback's play arm band" worked better for me as any strap holding the kneeboard on needs to be tight enough to hold it in place while the leg/thigh is constantly flexing . And that's just too uncomfortable for me.

On the trike, arm sweat gets soaked up by the band and it's a natural thing to just raise the arm to look at/read something. And I found one that has 3 pages that can be flipped - so it works well for multi-sheet cue sheets AND a mini-map.

So, the "quarterback's play arm band" was a natural once someone local suggested it.