Unfortunately, Napoleon does not manufacture a wall thermostat that can control both the operation of the millivolt valve and the thermostatic blower. The fan control you are currently inquiring about can be used to preset a desired temperature on a non thermostatically controlled fan.
However, I would suggest using the Napoleon Wall-Mounted Digital Thermostat
to control the functionality of the unit itself, while leaving the fan control of the blower set to the desired speed. The fan should cycle automatically with the unit, while the unit will be controlled by the thermostat. This should give you the desired operation you seek while still enabling you to manually shut down the blower.