Well, one way to avoid the issue is to drill the hole "almost" through the scale. Then, in short order, it will wear itself through the wood to the metal, which would take all/most of the friction away from the wood & transfer it to the metal. If you do use a lube, make sure it has a higher flashpoint than the wood that you are making the coals from.
You may want to look into "Fluid Film." It has a flashpoint of 405 degrees F. I use this stuff on my vehicles, battery terminals, electrical connections etc, to prevent corrosion. This stuff simply is awesomeness in a can. I can get it at my local John Deere dealer by the aerosol can, or by the gallon, 5 gallon containers.