I think that there are much better ways to become a part of Japanese culture than just about any Aikido dojo I've ever seen in the United States. In my experience most people who try that come away with a somewhat delusional view of Japan and Japanese culture.
And what about Japanese people in Japan, are they still trying to become part of a Japanese culture?
If you're talking about "traditional" Japanese culture, then how did that work for Morihei Ueshiba, was he also trying to become part of some culture? If he wasn't - than what was he trying to do? Shouldn't that be where we're trying to go?
I am not talking about general Japanese culture...sorry, I thought you got that with your reference to togas. People didn't walk around ancient Rome wearing those.