Nice one! I would count eight notes. I'm rather familiar with quarter note triplets over the bar line in 4/4 (You need to get "three-over two" down for this). Here it seems to be the same thing, just with eight note triplets (plus the quintuplets etc., which are all displaced an eight note). I would count 8/8 time, speedwise starting at 120 beats (eighth notes) per minute. That way you can simultanesouly feel a slow 4/4, then move it up a notch each time.