I'm at a point where I don't think there are any red herrings in the list. That would make the puzzle light years harder than it'd have to be, and the Book of Briars (rest in peace) was never one for fake red herrings. Everything had a meaning, even if it wasn't obvious.
Standard Disclaimer : The following is me thinking out loud and may be of no use to anyone.
I almost feel like these clues are 'tiers' in terms of their specificness (I think I just made up that word?)
Bersimis-1 is obviously a point at a specific place.
Maximilian's Execution is an almost obvious reference to Emperor Maximilian's exectution. Either the painting that's currently in New York, or the act itself which happened in Mexico.
Sallefavart is pretty clearly French, probably Paris. Add in Haussmann's Sanctuary and almost definitely Paris.
Those would be top tier clues.
At the bottom tier you have things like 'The Swallow'. That could be the name of any dive bar in a 1000 cities.
I'm guessing the intent that Fletcher had is that the very specific clues would give us the places where we were supposed to look for the less specific ones.