First, thanks for seeing if there was anything offered at Dauphine...I heard someone saying they do. But apparently not...
To answer to your questions:
Europe would be still within the reach, but preferably UK.
US is a little too far for us now. I say us, because I am married to a French, and she likes to be near her family...at least for now:)
To learn Japanese/...hmmm:
Depends on how good your level is!
If you are able to write Hiragana, Katakana, and at least 100 chinese charators, then yes, you could start taking some lessons.
Othewise, I dont see the point in taking classes, coz you'll have to memorise a lot.
If you have cleared the above, perhaps taking private lessons would be effective. Or otherwise, "Kumon Juku", traditionally for school kids, but very very good for all ages!!
If you are in the advanced level, perhaps you could attend one of the Keio Japanese language classes....you'll encouter many chinese students who already know 5000 chinese charactors
Basically, what do you know at this level?
Send me your e-mail by PM, and I'll send you MP3 files of Japanese audio lessons. They are really good!