I've got a nice collection of very old cameras:
* Kodak 3 Folding Pocket Model G (USA, 1910)
* Kodak Vest Pocket (USA, 1913)
* Ernemann BOB OO (Germany, 1917)
* Kodak Retina 1 A (Germany, 1951)
* Taisei Koki Welmy SIX E (Japan, 1952)
* Kershaw King Penguin (England, 1953)
And I've done some lens whacking with a DSLR: you hold the lens in front of the camera, without attaching it, and shoot video like that, moving the lens forward and backards to focus, and tilting/shifting it by hand, letting light leak in through the sides, etc.
So, why not mix those two? I took the two cameras that will allow me to put my NEX-5N where the film usually goes (that would be the Kodak 3 G -pictured above- and the Ernemann BOB OO), took away the back side, and placed them safely on a bench or similar. Then I took my Sony NEX-5N, took the lens away, and manually held it inside the bellows camera, looking at the screen while moving around the NEX in order to get good focus and take a still.
You can see the results here:
My take: they look so good that it doesn't even feel that they were shot with such old lenses! (specially the Kodak: click on the first image to see it at full resolution: that 100-years-old f/4 prime is surprisingly sharp!)