Would a workaround with a motorcycle stator be totally out of question? Well, since it wouldn't require a belt or a gear drive, presumably there will be fewer drag added to the driveline. If you eventually decide to go that way, making an enclosure similar to a brake drum for the stator and fit it between the transmission and the driveshaft like it was done with those older trucks with a transmission-mounted parking brake would be the way to go. Roughly maintenance-free too.
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