(I don't mind the revision, but am interested in why exactly)
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Comments are really the only way of doing so, as there is no PM functionality (nor will there be). Anyone who has revised a post is a valid target (source) for @replies via comments, so any @reply comment on your post will land in their inbox.
Further (though it doesn't seem to apply here), if you feel someone made a bad revision, you can always roll it back by simply finding the revision you want to roll back to and clicking the "rollback" link.