Rule of thumb: If it wasn't designed specifically for coal, you may not get acceptable performance due to the burn chamber design, grate system and underfed air supply.
All forum members will sure do their best to help you out, especially if they can see just what you're trying to do.
Personally, as in life, it's sure hard to be all things to all people, so just in case there isn't a coal solution, remember that the expertise here will get you aligned with a coal burning appliance that will work for you.
Don't feel intimidated about the learning process, no question is to basic, no situation without resolution.
Cool 19 degrees here....hope you are staying warm where you are.
PS: I've burned a few nuggets over the years, and have never found that wood and coal do not mix well. For me, it was either stay with wood, or change over to all coal. That was in a Memco 100, (eeerrrrrhhhh!!!!!) New Yorker WC 130, a Tarm 202 and an outside homemade creation. The folks that originally designed the coal burner equipment were light years ahead of what we novices of today are. Necessity is (and was) the Mother of invention.