Couldn't you just make The Feud unlock with Asgarnia? Then you could do My Arm with Asgarnia and Kandarin and Weiss if you also pick Fremmy.
Edit: Also is Swan Song unlocks anywhere? Since it needs Garden of Tranquility, that makes it impossible to unlock as well unless a region gives one of those quests.
I may consider just giving The Feud if that's all it takes for it to be possible.
I believe Kandarin should unlock Swan Song but the gif is incorrect, I'll check tomorrow when I'm back in the office