I would look to the world of "doodlebugs" for guidance here.
It was very common at one time for farmers to build tractors out of old cars/trucks. They would install multiple automotive transmissions, one after the other, to get the right gearing for field speeds while keeping the engine running fast enough to produce adequate power for the job.
You should be able to couple two or maybe three automotive style manual transmissions together and then find a gear combination that gives you the output RPM you're looking for.
The question is very vague, so I hope this is helpful.
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