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Have you used this device Mike? I'll be very appreciative to hear some user hands-on perspective on this.
No, I have not tried it, its rather pricey. But we did write to Stefan Steib and asked about it. Its not obvious looking at the pictures, but the lens collar holds the Canon TSE lens on the flat areas just in front of the shift mechanism. Thus one is still free to rotate the camera body just behind the shift and rotate the tilt (and tilt) just in front of the shift. However the shift itself can only be horizontal if the if the collar stem is vertical. The lens shift direction cannot rotate relative to the lens collar stem. If you want to shift vertically (ie perspective distortion), you need to mount the lens collar stem horizontally, which will be rather unstable atop the tripod. I was not thrilled by this feature.
Hartblei's own TS lens, 4/40 IF/TS uses Zeiss MF glass in a version of their super rotator T/S housing. Note that it comes with a lens collar, and the collar is attached in front of both the Tilt and Shift mechanism which are near the camera body.
I wrote a lens review of a much less expensive version of the Hartblei super rotator TS lens 6 years ago. I cannot search through the FM archives, so here is the DPR version. See part 1 and 2 on the Super Rotator T/S construction, other wise skip this old lens review, the performance parts are no longer relevant to today's lenses.