I finally elected to go through the wall, just not very fond of roof leaks, repairs, heights in general. But I did engineer a couple of heat shields for the corner it's in with a small house fan mounted on the ceiling above it. Not my best shot but it helped. The shields are about 4'x4' pieces of commercial roofing screwed to a couple of pallets. After I saw the heat they were catching I then stuck a heavy duty fan where it would blow into the corner around the heater, now we're cooking!
As you can see in the attached photo it was 49f outside and a comfy 71f and rising inside. Don't forget this is an unpainted block building with ZERO insulation. Pleased,,, no doubt, I love it!