I have moved the RSX signals to the outer row so they can be reached with a 2.54 pitch connector. This allows a PLC module to use screw connectors or other 2.54 pitch connectors for stand-alone usage “as is”.
An updated 3D model showing possible connectors if the 2×20 pin header is unpopulated. I see no reason not to do this change, but the RS-X line’s here are not isolated, so it must be used with care!