I am what you would call a hobby engraver, the guy that that can butcher a piece of metal cutting names etc., on it. My thoughts, the plating on most kits are not good enough for metal. I did a name on a real Cross Pen a few years ago, it worked pretty good, but a Cross and a PSI pen are 2 different animals.
If you want to try, I would recommend taking a Slimline to a jewelry store that does engraving and ask them to engrave it.