Thanks for your post, Drum Key. I tried out your second example of 16th note triplets as a double bass exercise: right hand, right hand, right foot,; left hand, left hand, left foot. I think your suggestion was to flam the second hand stroke. That made me slow down some I can tell you!
Have you ever tried just playing a full bar of 16th note triplets but with double sticking -- i.e. RRL LRR LLR RLL RRL LRR LLR RLL? When you move them around the drums and play different bass accents, it becomes a nice syncopated fill.
Does anyone know what the real pattern Portnoy is doing at around 1:08 of the song? I think he's just trading 4 beats between the hands and feet really fast, but I'm not sure.