Sounds like a good idea to me. From what I've read about casehardening both guns and industrial, timming is critical. The longer you leave the part in the carbon the deeper into the steel the carbon absorbs. You could make your part high carbon steel and brittle. Recasing without an anneal would be like doubling the time in the carbon soak. Remember the cracked frames we saw on here awhile back? That nice Stirlingworth? I once annealed a LC Smith frame in the oven on the clean cycle. It works and the steel was soft so I could file and polish it.