Let’s add a bit more tinfoil…
When I saw the idea of bringing the Book to now in exchange for someone, my brain immediately remembered this thread: "@Steve ! We have to go back.... Back to the past!"
Note: in no way should this be interpreted as me suggesting anyone in particular to be Weeping-Angeled back in time in exchange for the Book, all tinfoil and being tired.
(And yes, I made Weeping Angel a verb.)