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I would give it a try with the centrifugal clutch. One challenge will be to adjust the weights/springs so the clutch engages at the right rpm, but that should be do-able.
You might try gearing it for a speed of 35 mph at top rpm, and see how that works. Then keep switching out different size sprockets so your top speed is faster, until you don't have enough torque to start on an uphill.
I messed up the motor on my 50cc gas 4 stroke by trying to go fast when it was geared low (too high rpms), so take it easy at first.
Diesels have a fairly low rpm range from idle to the top rpm, so I would start out with a gear that is geared pretty low and don't expect high speeds out of a single gear bike.
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