I think if you want more of a guarantee those are the 3 options, for now.Guessing that a purchase from a boutique or high end company will still get you exactly what you want. I can't imagine Redline, HPL or Amsoil would substitute Group II for PAO...
PAO is not in a shortage, so RL and HPL PP should be fine.
Amsoil likely is ok as well due to their extensive supplier agreements and storage.