> Acute-Matte screens have been used in a couple of Minolta
>manual-focus cameras; perhaps one could be adapted. (..to Nikon..)

If this is the same screen that was in the Minolta XG-7 (and the
Leicaflex variant), I would not want it. I was unable to focus
a 50mm f1.4 lens with either body. The Nikon screens in late
cameras, both manual and AF, are bright AND contrasty, allowing
easy manual focusing of even slow superwides like the 15mm f5.6.
Hope this helps.