Lappa, Pagie. I think the speed is Ok. It can do any speed from zero to 1750 rpm.
There is no speed controller because it is a clutch motor. Actuate the clutch rod and the drive shaft starts spinning. Speed depends upon how far you move the actuator, and running it all day long at a low speed with the clutch ‘slipping’ shouldn’t be a problem as that’s what its designed for.
I suspect time will prove that it’s not really ideal for this task, but when I fully understand the requirement I can swap it out for another motor if need be.