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Well, maybe not "The King of Kings". I doubt Tolkien would EVER feel right about using that title for Sauron, even in the mouth of the wicked.
Personally given his old personal title translated to "The Excellent King" I might go with something along the lines of "The Lord/Master of All" (technically he isn't that either, but I'm sure Sauron's ego would love for his servant to think of him as the equal or even superior, of Illuvitar). Actually The Mouth could simply call himself something like "The Voice of Darkness" and those he spoke to would probably know who he was speaking for.
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