Squeeze's idea about putting in you G-suit pocket is a good one (and my first thought also), but it won't work if you fly in a plane with lower leg straps (T-6, F-18) which go right around the lower G-suit pocket.
Gator- yeah, not meaning to be a smartass either, just like you said, I don't care to have my PCL attached to my kneeboard. I think 95% of Rhino types bring a helmet bag full of crap and stick it in the well on the right side of the cockpit... never had that come loose.
I would say attaching a lot of sh!t to your kneeboard is an even worse idea... blue brains in the fleet can be several inches thick, and you don't want that crap bouncing around when you're rolling inverted or snapping on Gs.
I fly with a condensed checklist, a combat checklist, and a comm card in sleeves. Anything I else I need (weapons checklists or kneeboard card), I just put under the clip. Keep your kneeboard junk to a minimum