Sorry, late to reading this good thread. Some things to point out:
The amount of shift with the 47 Digitar for example, is not necessarily impacted by the Actus. The rear element intrudes into the Actus mount for the Sony, but it is prudent to re-focus when shifting anyway on a wide lens with significant curvature. So you would back out, shift, and re-focus. The additional depth of the Sony camera mount is necessary to provide the excellent seamless rotation lever to operate so smoothly and to maintain registration. Also the Sony grip does not impact the Actus standard, since when shifted, the Sony camera and standard move as one. I have not used the 40mm HR with the Sony, but I would expect the shift potential to be similar to the Schneider 43, perhaps a bit more.
Steve Hendrix
Capture Integration