I’m looking to put resin letters into my molds, my thought was to get 1” tin plated steel cookie cutters to set in the mold, pour the resin into the cutter and let it cure for 2 hours and then remove the cookie cutter and pour the rest of the mold. Would this work or is there an easier way to get a letter into my mold? It would be appearing on the front surface of a keychain.