This project is nearing completion and was not as onerous as first imagined. Largely a matter of coming to grips with the technology. Thanks to Joe for his ongoing assistance and providing the original circuit diagram.
A working circuit demystified the whole thing. Not so difficult after all.
It is worth noting that the hand controller connector is not a mini din. It is in-fact an Hirose 12 series 8 pin mini circular connector and not cheap - ~70% of costs. The mount socket on the board could have been a mini din, but I chose to go with the Hirose connectors throughout.
That's an RJ45 model - no RJ12 in KiCad that I could lay my hands on quickly.
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