That system sounds pretty much like floors 20, 40, 60, 80, and 100 of Nyzul Isle to me. So, I'd say something very similar is already in FFXI.

Also, I think I'd have better luck licking a choice spot on the floor of the general public restroom than completing a challenging task with the general public of FFXI. Changing imaginary trousers and casting Paralyna can be daunting tasks to some.