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Why not use a "centrifugal transmission"?
That popped into my mind one time. It's like a centrifugal clutch, but when it is below the throwout speed, it is sitting on an internal hub, with gearing to make it so that the output is higher.
So, above, say, 3000 RPM, the shoes engage the outer hub and everything is peachy. 1:1 drive ratio.
Below 3000 RPM, the shoes are still pulled in, but they are now sitting on an internal hub, which is geared so that it steps up the speed. You could still get 3000 RPM out with maybe 2000 RPM in.
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