Edit: Posted, and ended it at a good opportunity if any of you still wants in.
Anyways, I don't think the split timeline will be a problem, but I have to brainstorm a way for Nelly & Vivian to meet, considering it would be out of Vivian's character to introduce herself or put herself in a position to be approached. At most she could be inclined to stalk Nelly and party to her base and eavesdrop on them (I guess to check if they knew any other secret pathways?)
Unless we want to time skip that.and have linda scouting the docks