That's strange, both the base clasp and the clasp on the ModMic wireless are magnetic. I remember using the ModMic on the X2 directly without the base clasp which was convenient since they charge like $8 + shipping for just 3 base clasps. The mesh should be a metal that magnets can stick to. Try just sticking it on the mesh because I'm sure it should be able to stick and you can probably use the base clasp with another headphone! From what I remember it didn't scratch the metal, but if you're afraid of that, that's understandable.
I just tried it. You are correct, the mic side is magnetic. It worked, but there's a lot of play in the up and down movement without the base.