I was watching paint dry for a while this afternoon so I knocked this one off the to-do list. Mill some scrap true, route a couple of MatchFit dovetail grooves, drill some holes, cut the block into two parts, and add some hardware.

Micro-Adj-Stop-Block-v2 (5).jpg
It assembles like so.
Micro-Adj-Stop-Block-v2 (6).jpg
Clamp the assembly in the approximate positions you want via the right side.
Micro-Adj-Stop-Block-v2 (7).jpg
The screw knob moves the adjustable block 1/32" per rotation.
Micro-Adj-Stop-Block-v2 (8).jpg
Once adjusted to your liking, clamp the other side of the assembly . . .
Micro-Adj-Stop-Block-v2 (9).jpg
. . . and cut your parts.