How about using a small diameter "Long-style" pressure plate clutch from a car, with lower rate coil springs and larger centrifugal weights? That might work- it's kind of how scooter slipper clutch works anyway. Obviously, a fork/throwout and cable/lever arrangement would allow a full disengage, and the preload on the pressure plate could be adjusted by replacing/cutting/shimming the coil springs, and the final lockup could be set by using larger/smaller centrifugal weight rollers.
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Insert free thought here.
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