It's easier and safer if you just join a decent/good Gods/HNM LS.
Setting something like this results in alot of EXP loss, people flaking after they recieve their items, non-experienced players messing up the fight, etc, etc, etc. (Similar to O-hat runs)
I see DM written all over this post.
My apologies... I don't mean to sound pessimistic, but I would say Rostrum pumps is if not equally as challenging as DM, then pretty close.
The Uggalepih Pendant I've heard many times a really good PT with NIN tank can kill this NM, but I've personally never done it.
Good Luck to you.
~B