I got the bass back from my luthier today. He did a fine job, and was simply able to make the hole inside the old one and straight, as the N-PIN fixture is much larger. He charged for 2h45 which I think is fair.
By the way, in case anyone is in the Kitchener/Waterloo or Stratford, ON area and needs any work done I wouldn't hesitate to go to Henry Riedstra, who did this work for me.