Hobie has a 2010 patent for a rudder-mounted propeller system that is retractable, can be turned thru 360 degrees, and is remote cable-driven with a power source of human and/or electric assist. This design could simplify motorization, permit hybrid human/motor power through a single drive even with multiple peddlers, and eliminate the open drive-well hole in front of each person providing power. No idea when or if this will ever be productized given a decade has now passed. I currently use a rudder-mounted Torqeedo (eVolve) on my Oasis and see many benefits to the invention described.
Peter
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