Now have a new shooting board, with POM for the plane to run on and be guided by. A bit long, but I sooner stretch a bit than not being able to deal with wide boards.
(Please see photo)
Surprisingly, the shooting plane in question did not fit. It’s sole is specified to the same width as that for my other shooting plane (used for the setup), but was in fact wider and not parallel to the “face” of the plane. Thankfully, there’s a company that will mill (sorry) the sole to the stipulated 2 1/8″