@chrisb It certainly isn’t the ideal configuration like the Insteon hardware but at least it works. I had a similar problem to you but in my case I had power wiring to the ceiling fan without any wall switches. It was a remodel and since the fan had pull chains I didn’t get the wall switch installed. So I ended up installing both the fan speed and light controller inside the canopy.
Continuing the discussion from Control 3-speed Ceiling Fan and Light Kit: