Yea, I have one I made to use with JSGME.
Edit this file: Scripts\Aircrafts\_Common\Cockpit\ViewportHandling.lua
Edit these lines (about line 29-30) to move and resize the kneeboard. Here's my edit:
-- ----- MOVE & RESIZE THE KNEEBOARD ----------------------------------------------------------------
-- ORIGINAL CODE: dedicated_viewport = {default_x,default_y,default_width,default_height}
dedicated_viewport = {1342,10,562,750}
-- --------------------------------------------------------------------------------------------------
I have only tested this with the Mig21bis. I made my own kneeboard pages on the startup sequence.