I have finally finished my Caller's Attire +2 set (and, by absolute chance, starting the Unkai Armor +2 set) mostly through soloing Turul this weekend. I am under no illusions, however, that every job's AF3 +2 NM or its KI chain will be soloable. While Jewels of Wieldance, for example, can be obtained by soloing Ironclad Severer, getting Jewels of Balance isn't quite as easy solo.
I have no real answer to how AF3 +2 items can be made more accessible without changing the NM system aside from making Gold KI chests far more reliable and/or making the NMs themselves slightly less onerous to soloers now that Voidwatch has had the developers' desired effect of nearly killing Abyssea altogether.