I pull the first two ramparts on the left without making them link (thus fighting DRK Fomor instead of three RDM and three BLM which I've found to be an instawipe). Then I aggro the third Rampart and pull it back, kill the three PLD that spawn. Because the Ramparts attack so slowly, you can put sneak up or use a Silent Oil or Jig after it attacks you, and run passed the fourth rampart, forcing it to spawn MNKs as it links with the Third Rampart. Kill everything in the final room which is where the NM Rampart also spawns.
This works perfectly for me as it'll unlock all stats and HP/MP, and spawns the NM.