I would be possible to skip the "all" but, in the original it were all Elves of the West which would incloud all those that lingered still in Middle-Earth. Thus in the original the knowledge was not restricted from Middle-Earth and I would not do so in our version. We have in addition not in any way made clear to which date the Words reffer. Thus it could reffer to the later ages when Numenor was no more. With all that I can't seen a forcing reason to restrit the rumor to the numenorens by skiping "all".
I don't understand what you would like to suggest with the addition of "(or Elves?)".
Respectfully
Findegil
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