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What about machining a standard used sprocket to become a sprocket holder ?
Obviously your rear sprocket needs to be spaced the same.
Best economy is around peak torque AND at 75% throttle.
I would not fear about that 75% throttle thing because you still have 25% if needs be.
Waste mode is a personal naming that I give but basically it's away from peak torque and incidentally bikes are usually set up on the rich side at either side of the rpm for safety reasons.
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