Welcome to the forum. I can understand the need to look at alternative fuels with the shortage of pellets, there is quite the pellet panic going on. Have you looked at horse bedding pellets? I understand they are close to wood pellets, but not quite the high quality you would be used to. http://www.tractorsupply.com/en/store/t ... ding-40-lb
How about shelled corn, I know some pellet stoves can burn both.http://www.tractorsupply.com/en/store/s ... _vc=-10005
Some thoughts regarding rice coal in a pellet stove.....
I'd be a little concerned about the operating temps the stove can handle too. What do you generally run the pellet stove at? My rice stoker can get to 600* on the sides and front routinely when burning flat out for an hour or so. You may not hit that burning coal in your pellet stove if the amount of coal being burned is less.
Also, be prepared to do an extensive & thorough cleanout of your exhaust pipes when you are done burning this year. The fly ash will eat away at the metal flue pipe and will not be kind to your stove either as the summer humidity hits it.
I'm curious what gauge steel or " thickness is used on your pellet stove body.