It seems like once your pike is pretty darn good and you're working with some higher weight there would be a lot of room for some variation to emphasize different things (with reduced weight of course).
Some that I've thought about are wide legs, toes elevated to emphasize heal stretch, single arm for some crazy anti-rotation, maybe different grips, different degrees of turn out (fifth position JC anyone?)... I haven't actually tried any of this yet, and I don't want to murder my body but I would think if you're smart and cautious about it there might be some good transfer. Thoughts? Words of caution? Anyone tried this?