Thanks for this. It seems others need the same thing. My need is for 200x200 spacing but actually an offset using just two 200mm spacing holes such that it could be attached between the TV and any mounted stand would be ideal. So In this variation the RPi would sit offset to one side or the other of the VESA holes if there was a mount or could be in the middle if no mount. I believe two holes for mounting would be enough given the light weight of the RPi. The 200mm mount example shown (thanks) could work except the thickness of the plastic hole mounts would require a spacer on the other side if the TV is mount and accordingly longer M4 bolts but that would be fine.
My other concern with that design is the cost and open PRi mount so I will continue to search.