Haha, did a bad job explaining :P
You need the 5 items that the NM will drop and even though you can trade unmarked keystones most parties I do mog with will kill 2 or 3 NM then trade for the rest of the items.

But the point of what I was getting at was that parties should be fine to do it when going for mog :P (especially since they're all in the area surrounding the moogle fight)