This thread is a combination of good detective work and logic coupled with necessary speculation. An alternative to struggling to determine if, how and when Earendil became fluent in Mannish tongues, Occam's Razor may provide an alternative.
Earendil hoped to deliver an appeal for aid against Morgoth on behalf of both Elves and Men to the Valar. He planned to deliver the appeal, if he was allowed to present it, in the languages of both races. He does not need to become fluent in the Mannish tongues. He only must deliver the message. To do so, he needs to learn only enough to make his entreaty or he could simply memorize (or even write down and read) the messages.
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Beleriand, Beleriand,
the borders of the Elven-land.
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