This is where I ended up…
Shared models in my usual V1E mod repo at https://github.com/aaronse/v1engineering-mods/tree/main/mp3dp-v4/mods/filament-guide, and on Printables.
Works, but the straggler CAN and Runout Sensor wires need extending/replacing so they can be routed/mounted neatly along the extrusion to the controller box resting under the bed plate.