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Protein, or any other product will not revert relaxed hair so I wouldn't worry about that. I'd do a hard protein a week or so prior to the relaxer to prep for it.
Check out the following 5-page thread entitled, "No Hardcore Protein for 2 Weeks After Relaxer." The first post on the thread was from 2003, and the last post was from 2010. There were a few other threads where users were advised not to use heavy proteins too soon after relaxers.
Click here: http://www.longhaircareforum.com/showthread.php?t=13648&page=5