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Found a solution
This motor gearbox will run quietly at the right speed with 12VDC.
It can take 40V DC but that would run to fast.
It is used as a door motor in KONE elevators.
Easily available at a cost of about $100USD.
Also has an encoder (which I won't use).
It so happens, I had one in my garage all along, buried deep.
I used to be a lift mechanic :-)
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