[Formendacil]

The possibility occurred to me that if one wants to somehow cram this final scene into a package that makes it both a definitive happening and acceptable within the confines of the translator's conceit, one should perhaps look at Aelfwine...

Although Tolkien seems to have decided that the Straight Road was a one-way street, he never did quite abandon the idea that Aelfwine/Eriol travels to Eressea, learns the lore of the Eldar, and transcribes it for future generations- with that knowledge somehow having to make it back to Middle-Earth, to ultimately rest in the hands of J.R.R. Tolkien...

Perhaps the view of Eressea that we are given is the universal arrival view, as seen by Aelfwine. After all, it was Tolkien's cherished conception that the Silmarillion and the Lord of the Rings be published in tandem- and Aelfwine was still conceived to be a part of the story.

A bit of stretching going on in my little theory here, and it certainly begs the question of how Aelfwine's lore made it back to Merry Olde England, but it's what came to my mind...