There are some very difference opinions in this topic. Principally two opinions divide fountain pen users in two sides.
- An engraved fountain pen is the perfect personalized writing instrument.
- I would never engrave my pens
I think it depends on your circumstances and the pen. If you plan to keep the pen then it can be a nice touch. Engraving pens have a sentimental value, but decreases monetary value. If you plan to cycle through the pens, use them a bit then sell or trade them, then an engraving wouldn't be a good idea.
I know that not an answer to your special question, but you should think about this. For the other side, if there is a place for a personalized engraving I think it would be safe.