The only reason for serf to be doing this is so he can tumble with the primer out to help clean the pocket. A drill press is just a fancy arbor press.
If I were to do this, I would simply buy a replacement decapper pin for the lee universal decapper. A nail will bend too easily. In fact I have one that I've never needed.
Haven't managed to break the one that came in the die. (That's amazing in and of itself, I'm pretty good at breaking so-called unbreakable things).