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Many thanks Larry! You are the polymath of WWMC.
Happily, I found provider of cut to measure acetal. Once past the weekend, I’ll contact them. Their home page informs on a bit of delivery times; hence I wonder if the below suggestion can be something as a temporary solution.
To assure square to the surface cut, I made the below guide. Basically a strip of beech with quite strong magnets running in a groove, and a strip of brass along the bottom, it holds chisel backs very firmly. The brass has not harmed the chisel edges, but, please may ask:
Is there a risk that it would abrade the edge of the shooting plane?
There is some space available along the width of the shooting plane guide, allowing for adhering a brass strip to the rail, and still be able to run the plane. The strip is a meagre 1/32″ taller than the edge of the plane, as to why hope the brass will not abrade the plane edge.
If you can put up with a final question:
Would epoxy glue and using two wedged pieces of wood to give pressure, be good enough to hold the strip?
Is it very impertinent to ask why Mr. Eastly needs a shooting board, given his access to machines; or could it be that the Bosch cross cut and mitre saw isn’t sufficiently accurate?