I did a little with camera movements long ago, on a modified 9x12cm Graflex. There are good reasons why commercial small format (35mm/FF and APS-C) and even medium format (6x7cm and smaller) movement gear is rare.
* Larger formats offer lots of space for total flexability, total control of the movements -- rise and fall, shift, tilt, and swing -- of both the lens plane and film/sensor plane. Some extreme contortions REQUIRE all that space. Some images can be achieved no other way.
* Larger formats can handle many lens choices, to provide an image circle that will fill the film/sensor frame.
* And larger groundglass size (and hand magnifiers) let you closely examine just what your maneuvers are doing to the image.
Adapters for small format (35mm and APS-C) typically only move the lens plane, and only with tilt and shift, not rise-and-fall nor swing, and they can only T&S a little ways. So you lack many movements, and much range of motion. You have limited lens choices, especially at wider-than-normal angles. And it's pretty hard to see just what's sharp and what isn't, in the small viewfinders.
Here's an overview:
Tilt-shift photography - Wikipedia, the free encyclopedia - Canon and Nikon make nice T&S lenses. Right. They're used in architectural photography, and some miniatures work, etc. If you get paid for shooting that stuff, that's the gear you'll use. Otherwise:
* You can easily build Lensbaby-type fittings, cheap, and get cute effects, rather lacking in fine control. Hey, fine control is much over-rated, and it's a real pain in the ass to achieve. Try working a view cam sometime, eh?
* You can buy a MF-to-PK T&S adapter, not so cheap, and face the lens limitations. Hey, limitations are GOOD for you! They build character, and inventiveness, and envy. (I never believed the line, THAT WHICH DOES NOT KILL US, MAKES US STRONGER. No, it only leaves us crippled and agonized. But I digress.)
* You can fake it, shoop it. But what's the fun there?
Anything else I say will just get stuff thrown at me, so I'll stop now.