I agree about he centering spring, it would take a bit of work to enable the throttle level to do this mechanically.
It would obviously depend on the intended use...
and the amount of electric assist desired when operating the ICE.
my thought would be to use the electric motor to drive up to 40 km/h (25 mph), then engage 5th gear wit the ICE, maintaining some electric assist to avoid lumbering up hills. Or one could start rolling under electric (say 25% duty), then accelerate as normal with the ICE (however beginning in a higher gear say 2/3), then reduce electric motor duty to 0% once cruising speed reached.
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