It looks like it will work, Karl.
The description for the adapter says: "Mounts Mamiya RB67/RZ67 Mount Lenses to Nikon F Mount SLR Cameras; infinity focus or beyond allowed."
The lens electronics won't be a factor in this case since you can use manual metering.
There is a manual aperture ring on the Mamiya lens, so you'll have control over that as well.
And you'll have manual focus with the adapter's helical focus ring.
Looks like a viable and fun solution.
Please PM me if you're interested. Thanks