I'm not sure "Middle-Earth is a fictional backstory for the real world" is sufficient grounds to bring all Tolkien set on our Earth into the same scope in and of itself, but the other details you supply are much more persuasive.
However, I think that if that is what the nominator intends we need an even broader fandom tag rather than trying to request it from within the Middle-Earth section of the tag set, and with some worldbuilding tags that are much more specific on what sort of points the nominator is interested in exploring. I'm almost wondering whether the canonical "J. R. R. Tolkien - WORKS" would be the best (or least worse) choice in this particular instance. (Again, if that is what the nominator is angling for with that tag.)
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I'm not sure "Middle-Earth is a fictional backstory for the real world" is sufficient grounds to bring all Tolkien set on our Earth into the same scope in and of itself, but the other details you supply are much more persuasive.
However, I think that if that is what the nominator intends we need an even broader fandom tag rather than trying to request it from within the Middle-Earth section of the tag set, and with some worldbuilding tags that are much more specific on what sort of points the nominator is interested in exploring. I'm almost wondering whether the canonical "J. R. R. Tolkien - WORKS" would be the best (or least worse) choice in this particular instance. (Again, if that is what the nominator is angling for with that tag.)