[OldRestorer]

Filler can be useful in certain areas but on the front face that is going to be toned a light color it will not hide well. If it was an area that was going to be toned a Dark walnut it could pass but there is nothing for the filler to hold on to or "fill". It is a flat vertical surface only 1/16 of an inch thick but covers a lot of surface. What will it look like having a 1" circle with no grain pattern. Unless you want the hand paint on the grains on before toning.

Sure it can be done but not by me personally.