With all of that said I do need some help from a benevolent soul who has both a Saturn 3D pad with the factory cable, and a multimeter who can probe out both ends of the cable and help me produce a pinout so I can design a PCB for the controller side connector. I'd do it myself, but I do not actually own a single Saturn 3D pad cable, so I don't have a way to without buying another 3D pad; something I'm not eager to do.
Here are the pin numbers for both the plug going to the Saturn Controller port, and the edge connector on the plug going to the 3D pad.
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Saturn Controller Plug 3D Pad Plug Edge Connector
/-----------\ 1 3 5 7 9
| 987654321 | ____________
|___________| |____________|
Looking into the plug 2 4 6 8 10
Looking into the connector
Back of connector facing down