I have done some more digging and since it is a DC motor, you will have completely different torque curve, with some significant torque available from the start. Theoretically many times higher to what I can get on my 2.2kw spindle at very low RPM, assuming your spindle DC power supply can handle it, it might actually work!
You would need to sort out the manual speed control and the reverse operation, but other than that, it should work.
