Regarding possibility 3 listed above, I think that Arwen had woven his banner with the insignia of the Kings long before the War of the Ring ever started.
It is almost impossible to imagine Middle-Earth without Aragorn marrying Arwen. His life is so shot through with the fulfillment of prophecies that there's almost no one else that he could marry. Consider that by marrying Arwen, the lines of the Half-Elven are reunited, which had been sundered since before the establishment of Numenor. That's a long time. Arwen was also about the only person he could have married to reestablish the Royal House as it was of old Gondor, strong-blooded and long-lived.
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