VIVO Steel Universal Full Motion Pole Mount Monitor Arm with Removable 75mm and 100mm VESA Plate, Fits 17 to 32 inch Screens, Black, MOUNT-POLE01A

Does your desk have poles on the sides? I have a glass top as well. My solution was VESA pole mounts for monitors; I clamp them on to the poles supporting the glass top. You'll need some kind of VESA adapter to mount to your HOTAS, but you can do that as simply as using a small thin board and drilling the mounting holes for both VESA and the VKB into it. https://www.amazon.com/VIVO-Universal-Monitor-Removable-MOUNT-POLE01A/dp/B083F3RPRK