People sometimes dowel and drill again. You are certainly not the first person to have this issue. I always think to myself, “It’s come out of the country that built The Great Wall and look how crooked that is! What do we expect? Must be the same guy.” Hello Chinese friends. But seriously, what are you planning to do with the headstock? Natural or stained on the body I assume. If you dowel and drill will the edges of the ‘fix it’ job be hidden?