Whether it works or not is one thing, the problem may be the focal lengths available for the P6x7. The widest lens is basically the 45mm f/4, this is equivalent to something like 21-22mm in 35mm format - but on 35mm it will be a 45mm lens. Would a 45mm shift lens be of use in 35mm (longer lens are less likely to be useful when shifted)? The wider P6x7 lenses aren't enormously expensive, but they're still expensive compared to many 35mm equivilents.
A quick look on eBay suggests Nikon 28mm or 35mm shift lenses are going for as little as £300-400 - surely a better option for a Nikon shooter than a P67 lens on an adapter?