Just curious why not spend just a couple more bucks and get the GE Smart Fan Control? You could always use it like a simple on-off application BUT it gives you the option to use fan speed control in the future. You don’t lose what you trying to do right now with the simple on-off so it’s a low investment to insure a very useful fan speed option one day.
Or for less money get the Zigbee option and control BOTH fan speed and lights separately! This is the one I think you might consider for the most flexible control.