I am trying to mount a Nikon D3s (with camera L bracket) and 70-200mm to the M1L upper rail QRC-40A. The lens collar has an Arca Swiss lens mounting plate. The lens mount and the camera bracket are offset by 90 degrees.

Can anyone recommend a "fix"?

The only way I can come up with is to have (2) 210 rails with (2) QRC-40A mounts. One of the QRC-40A would be rotated 90 degrees.