I suspect not that well as the decal must be close to the surface, which is why I suggest much more ca. These are give aways for freinds so I am not concerned if they do wear off as I have told them its an experiment.
If I was doing this on pens for sale I think I would either apply a lot more coats of CA or spray laquer with an airbrush to make sure the decals are well covered.
Be interested to hear your suggestions.