It actually looks like it might be, seems it involves killing 2 NMs and getting the castle zahval coffer. NMs are a 62 ranger and pld. Not sure if you have to fight them together tho.
I know absolutely squat about what a 71 BST is capable of soloing. I can tell you that you do fight these two mobs at the same time and that any other Orcs in the area (within linking distance) will link.
Guess it really boils down to you soloing/kiting one while your pet kills the other or keeps it occupied.
Shout in Whitegate or Jeuno before you head out. If I remember correctly, you can respawn the mobs before you actually trade the item they drop to the well. This means that anyone needing the dropped item (who hasnt started or gotten to the point in this quest) would/should be willing to go along so they only have to trade the dropped item they get to the well when they are ready.
Please send me a tell Sargoner if you are still interested in doing the Af quest. I hunted the coffer key after killing Dark Spark, OMFG the high lv demons agro like my wife on rag week. I ended up having to stick my pet onto 3 em demons to gain enough hate so i could warp :( I survived as i had equiped my tele dem ring before hand in case of emergency /cheer. If anyone else on Shiva fancies a crack at this please send me a tell/message.