Kipon shift adapter

Looking at the red dot, the knob would be on the opposite side of the grip.
They also mention that it won't fit the OM-D, most likely because it's tto wide and interferes with the "prism" hump.
The tilt transformer has the same issue...
Rudy

 

The Ad mentions 360° rotation, which would be similar to my tilt adapter (hopefully better made though, on mine the rotation makes things very difficult when I'm trying to get the adapter off the camera). Once mounted the adapter will rotate all they way round so that you can shift in any direction.
Effectively you can have the knob in any position want as long as the camera doesn't foul it.

 

Is this kind of adapter really useful? Shift lens had short focal length, like the Zuiko 24 mm.
The shortest lens I had with my OM cameras was a 17 mm Tamron. With the x2 crop factor, this is equivalent to a 34 mm, a not-so-wide angle.

 

For OM mount, I agree - there's not much use. But for Nikon F mount, it could be used with the Samyang 10/2.8, 12/2.0 or 14/2.8, or with any of a variety of APS-C zoom lenses like the Sigma 10-20/4-5.6 or the Tokina 11-16/2.8, though in the second case you'd lose control of the aperture. Still, pretty wide.

 

It depends an enormous amount on the lens. The actual image circle for full frame and APS-C lenses vary widely - some barely cover the specified frame, others cover significantly beyond.

Fair enough. In any case, shift lenses are falling out of fashion because their original purpose - correcting perspective distortion - is fairly easy to tackle in software these days. That wasn't the case with film. The only major use these days is for perfectly stitched panoramas, but there too you need a precise assembly to allow you to shift the camera by the opposite amount of the lens shift.

I'd say a more interesting option for your lenses would be a focal reducer for a wider view, or a tilt adapter for selective DoF. I've got a cheap Nikon tilt adapter and it's a fun thing to use on occasion, though I went for the cheaper clone ($60) rather than the Kipon.