flybymike
You have been incorrectly advised by both AOPA and your examiner. Ask them to read JAR-FCL 1.245(c)(1)(ii)(B).
So long as you have completed the 12 hours SEP, then any other profficiency check or skill test, on any type or class, replaces the requirement to do an hour on the SEP with an instructor. You do not have to do a SEP check or test. Any TRE can sign your C of E.
However, if you allow your SEP rating to expire, even by one day, then you will have to do a SEP skill test.
Airclues