I am pretty sure this is not possible. So many reasons why not.
The more advanced editors allow you to only re-encode around the edit points (they just re-encode that GOP). I think this is as far down that road as you can go though. It isn't possible to only re-encode a slice, or if you did you would be able to notice the line between slices. You cannot just add "extra" macro blocks, you would need to re-encode something.
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