theaug,
Yes, Swiss Army Knife will do it. If you have a Premium membership, just download the GPX file using the pocket quiries and then load it into Swiss Army knife and make the changes you want to make. I have mine setup so that it will change the "Code" information to the waypoint + (Code). Once you've got everything the way you want it then save it as a GPX file and open it in Magellan's POI editor and load it into your machine.