They never reprint the SEP rating on your page unless you are sending the paperwork in for that purpose.
If the SEP rating is revalidated by an examiner, either by experience or proficiency check, he signs your ratings page and you send a form off to notify the CAA.
My understanding is that this is simply kept on record and not necessarily even processed unless they need to for some reason in the future. Next time you get your SEP revalidated, you could get the examiner to add it to the page with any other relevant ratings so you only have one page to worry about.