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Last I heard from BM, SRM never did work for them.
If Benchmade says they were never OEM manufacturers, then that is what I would go by.http://www.bladeforums.com/forums/showthread.php/845287-Benchmade-Vex-VS-Sanrenmu-962
This old thread has some interesting things, including links (now broken) to an SRM page that listed several BM's that they were OEM manufacturers for.
Not the best answer on my part I know, but I remember the Vex, I really loved the design and wanted to see it in 154CM. Sadly it vanished.
If Benchmade says they were never OEM manufacturers, then that is what I would go by.