It's a bit bush-league, but if you only have a few dozen to do any 4-6" piece of 1/4" diameter steel rod (the shaft of an old screw-driver, a stripped 1/4" hex extension bit etc) and a few minutes on the bench grinder gives you something you can chuck up in a drill press and deprime quite effectively by using the down-feed wheel. Just narrow the last bit of it down to fit through the primer hole and it works great.
If you ever break it, say "Meh." and head back to the bench grinder to put a new tip on it.
Ulrich