Hartblei(? I think thats what it was called) makes some for EOS manual focus. You need to check if it reaches the angle you are looking for. Also, I know they have versions with high quality glass (Zeis, I think), vs the not so good kind. I think they are based in the Ukraine.
Then there is Novoflex, they make the best gear I seen for these types of add-ons. They have one that is called the BalPro I believe, and it does the full tilt shift.
I have tried the 4x5 plate to EOS, and its not that fun. On smaller snesors, if you are not using digitar lens, the quality is not so hot, and its a pain to see as 35mm screen is not so bright (outdoors maybe better).
There are others that are now coming to mind...CAMBO used to make one also. Very high quality, I tried it out, and it is rather hefty for studio use, so i dont know if it would be the choice for field. Novoflex is rather solid but it feel light and its somewhat compact.
I think the Novoflex would be super, but it is not a cheap system. If you use Canon lens, you will get auto focus.
hope this helps