Pocono Stove in Daleville, PA has the kit...I don't know if it's something he put together on his own, or if it's available elsewhere. Basically, it's a replacement top plate for the carpet feed/combustion squirrel cage assembly, mated to a Dayton combustion fan, so it was an easy, one wing-nut replacement (I'm not sure how that setup compares to the Channing, or if he has kits to fit that as well). The Coal Trol I got was the standard unit, not the plus. His price for the whole kit was very close to what I would have spent buying the Coal Trol directly and obtaining the combustion fan from Grainger.
The combustion fan does not vary in speed, which results in a good burn even with a very slim fire. Because air is always blowing through the grate at high volume, the coal burns more efficiently, and I'm able to set the minimums at much lower temperatures than I would have thought possible. On a mild day, my surface temperature might only be around 100 - 110 degrees, with maybe 1/2 inch or less of fire on the grate. The convection fan, above the hopper, DOES vary in speed in a relationship to how hard the stove is cranking. I put an inline switch between the convection fan and the Coal Trol so that I can cut off the convection when I'm loading the hopper...helps keep from blowing coal dust around.
I'm really very satisfied...I have my thermostat set for 73, and the temp maintains very well. I programmed my setback to actually run at 75 for two hours in the wee hours. That gives the stove enough time to boost the heat and ramp back down just in time for me to get up in the morning, so the house is a little toastier without overshooting. Other than that, I never need to fiddle with the thermostat.