I don't see any way to preserve Path except by renaming before reinjection.
Reinjection is a POST through an injecting agent, after all.
So, injection inserts a "POSTED" and reinjection inserts a second "POSTED"
which, if the article then appears "iffy" or otherwise spamish, directs
your attention immediately to the point to which your suspicions should be
directed.
Either injecting agents are responsible for adding trustable headers to the
proto articles (after removing any that are present) or they are not.
Destruction of evidence can only hinder forensics.