Still looking at the increased torque of reduction from higher RPM motor, but due to gearbox complexities, have considered a belt drive reduction. This is a concept of how this might be achieved 3:1 reduction. The belt is open in this iteration, and for this rendering, the teeth in the belt are not detailed, pulleys are actual scale and sized for teeth. It should be clear the approach from the renders. Decent protection on the front of the rotor with minimum flow interference. Downside, everything is spinning and may need a stator section in the rear to clean up the flow. Not as sleek as the torpedo pod family.
Please offer feedback!