Horseman has introduced a revised version of their VCC system designed for DSLRs. The VCC (view camera converter) allows for view camera movements on DSLRs. Expected MSRP is $1999
IIRC, this is slightly cheaper than their old VCC, which is great, and it looks like they're using bag bellows instead, which should allow a greater range of movements.
These setups are interesting but they almost always fail to offer infinity focus with relatively wide lenses. The manufacturers blurb makes no claims about infinity focus with the lenses specified but it lists the 90mm as being the shortest large format lens that can be used. Although they list Hasselblad, Pentax and Mamiya lenses as being able to be used I wonder if you can achieve infinity or if they are just suitable for product shots?
Mamiya 645 goes to 35mm wide, and will work on this rig thanks to retrofocus design. 45mm and 55mm lenses are said to be substantially better than the 35mm though.
But yes, for Rodenstock HR glass 90mm is probably the widest. Maybe the new 40mm retrofocus lens would work, with its ~70mm registration depth. Get out your big wallet though.