LOL this is an old thread, but I'd say you're overthinking it. I don't think there is an American school of bonsai, or a European school. I think some people prefer trees that are more artificially designed and have a more manicured look, and some prefer trees that look a little more natural and wild. However show me a formal tree of either type that is planted off-center in a pot that has won a major award
It isn't going to happen. Not because you CAN'T do it - but because it breaks too many rules of design aesthetic
and balance.
The "revolution" caused by some cutting-edge professionals in bonsai is pretty nuanced. You have to be pretty advanced in bonsai to really understand the difference between "old style" and "new style" or "formal Japanese" versus "natural European". They all follow 95% of the same rules... and play around with 5%.