I think this is a great idea. Although Devil Manta isn't an NM he's just the oddball.
My boyfriend on 75BST solos Devil Manta. Him and a friend thats a 75THF used to fish up Devil Manta and get the drops occasionally, then split it between the two.
I think it would be great for us to go down there sometime. It can get frustrating though when there's like 8 thfs crowded around the pond.
You know Peacock Charm? What if someday we decided to go do that BCNM, "Under Observation". I mean its in a bit of a chance you can get one but its a 2 million item.
There's a BCNM that I need to do to get Penitent's Rope, "Wild Wild Whiskers" those things are like 300k.
Anyways right now I don't have a certain NM that I can think of.