Might be a long shot, but as Jon is known for reusing words and phrases throughout a writing cycle, I think there is a possibility that Who Would You Die For is a new song. Which is because of the THINFS line "the wolf is at the door", comparable to "the big bad wolf is knocking at your door" in WWYDF imo. I would also say that the general vibe of the song doesn't really fit to other recent BJ records (but that is just a feeling of mine).
Why he would write a song with a chorus he definitely is not able to perform live? I don't know, but maybe this is one of the reasons it ultimately landed on BB.