Our solid fuel Rayburn gets very dirty and sooty over the oven and at the bottom of the flue box.Lifting the large, heavy metal rectangular plate is proving too much.Someone recently suggested getting a replacement plate made from a lighter metal without the heavy' fins'on the underside above the firebox and maybe splitting it in 2 so we could just lift the side above the oven and clean it.We do not cook on the top of it and it doesn't heat water or rads.Does anyone know if this idea would work or will the new plate warp.