I think I would start with the basic unregulated circuit first to see what is attainable.
I would connect terminals F and D together so full potential should be available between terminals F/D and the body of the dynamo. (see circuit post 18)
I think using a variable wire wound resistance might be much the same as controlling the engine speed manually.
I would also check out bulb availability and investigate the dynamo’s output at 6 Volts.
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