I bought my last shift-adapter (pentax67 to mamiya645) about half a year ago from mr. zörkendorfer. it is realy a one man operation and not much of a modern one in a sense that he doesnt always reply to emails . also he is not the youngest and always seem to be very busy with his latest inventions. but if you phone him (not sure how good your german is?) you might not get of the phone for the next hour or so. for my last shift-adapter I had to wait nearly a year till he decided to built a few of the pentax-mamiya ones. I also use a pentax645 to canon and a mamiya to canon shift adapter. I couldn´t possibly do my work (architecture, interior and furniture) without his adapters. they are the technical heart of my business - well made and reliable and allow you - for example - to use the pentax 67 lenses (which are good and cheap) as shift-lenses on a mamiya body.
If you need help on the language side of ordering your adapter, let me know if I can help you.