
Things like asking Osse for help to solve human problems could still be consistent with the Blue Wizards already trying to open a portal to the Void to say hi to Melkor (who is a Vala), which could be related to traffic cones on the Straight Road to break all connection to the Undying Lands and render it vulnerable to Melky. Or not.
But the idea of dark men of the east, opposing the sun paladins and politically grappling for power to help give the blue wizards or a dark captain assistance in bringin in da void, could be very consistent with a focus on men. (Also: palantiri between eastern capitols!)
I especially like the idea of basically running political dissolution in reverse. The basic history behind LotR was: Numenor -> (Arnor + Gondor) -> (Rhudaur + Cardolan + ... + Gondor).
Now T4 has added Numenor -> west + east, or dunedain + oroedain. Perhaps the good oroedain, the sun paladins, are holed up, and are in charge of reuniting the lost kingdoms of the East (lost to the black oroedain) so that the new eastern king (the Sun King? har!) can make a push to stop the blue wizards and or dark captain or... (Or maybe the kingdoms are like a swiss confederacy!) This would somewhat parallel Aragorn heading to Gondor to reunite the north and south kingdoms, but in LotR this was a purely notional reunion (although Gandalf did say to Butterbur after the War that Aragorn would probably rebuild Fornost), and the notional union just headed east to give Frodo a distraction. Here there could be a somewhat more real reunion. It could be on an even grander scale, to create a new numenor despite the bent seas, bringing east and west together. (Tower of Babel anyone?) But such a story would always be a backdrop to the basic idea of trying to stop someone sending an invitation to Melkor.
There's something interesting about sunset and sunrise--Tolkien seemed to be a bit fatalistic about Middle Earth, that even if men won, the passing of so much beauty from the world would be a tragedy. The fact that Faramir bowed to the sunset before eating with Frodo always had something a bit sad about it, and Tolkien's fondness for making things eastern evil always seemed in tension with the fact that sunrise is normally thought of as a wonderful beginning of things. To Tolkien the point to the fight seemed to be that evil had to be vanquished if only to make a washed-out grayness possible. Fin de siecle in the middle of a century, even if a rough one.