Yeah if it came to it and the blade did chip or otherwise get damaged, he could use a sharpie to touch up the black and then hit it with a tiny bit of wipe on urethane. It seems that it survived the party with no damage though, so no need to go down that path yet.
As for duelling, he’s the same nephew that has the Xiphos-style sword too. He’s pretty sensible though, so I think we’re mostly safe? The two swords are pretty similar in length, but Telikos has a 3-layer blade and is significantly more massive and sturdy. I would go with that one if it were my duel 