Beattie Intenscreen

What I would really really like, in all my cameras, is a dark matte screen with lots of snap, combined with a microprism circle (not a ring, but a full circle) in the centre. This is essentially the Nikon Type J screen, but with more snap to the clear part. The Nikons are hard to find (for the F801/F801s at least) and Beattie doesn't make them like that. Arghhh.

I love microprisms- how they subtly vibrate around the focusing point and then suddenly snap into tranquility. Brilliant stuff. Pity that it's implemented so rarely. Maybe these screens are difficult (expensive) to make?