Post #33. Also post #27 is not a spool of any kind, it is a device that uses pressure via the pin wedging it to the gears. It kind of cheap and crappy and would need modification to hold up for long. My idea in post #33 is different.
Ok, I see it now. But, as you said, the gears now become the "clutches" so to speak. Very high wear. Also, unless you somehow convert the unit to four spider gears, good luck with any type of performance driving.