Oh probably, I was thinking of a smaller blender or someone who hasn't got much to lose. Shell wouldn't do it, neither would Mobil, and I doubt Castrol or Ashland would be interested, either. Usually, though, if something can be done for a profit, it will be done for a profit by someone.
I do know that certain dexos1 metrics, like the Noack limit, would be much easier to meet if they allowed something like a 10w-30 grade, which, of course, is not part of the specification.