Jeff, there ARE Nikon to Canon adapter rings that include a lever which gives you manual control of electronic aperture lenses.
As for the RED Nikon mount, from Jarred's May product update:
Nikon Lens mount - Aluminum - Starts shipping in 90 days
Nikon Lens mount - Titanium - Starts shipping in 90 days
So there will be a 'cheap' version. Three weeks or so to go!
Mike



