My honest questions is how come you want to practice so badly in Japan (especially because it seems as if a collection of you don't know much Japanese)? What are the pros and cons?
I stayed in Japan a few times either through an exchange program and once through going to high school for the summer there. The language is difficult to master, especially if you haven't been able to practice it with natives. In a nutshell, its three forms of written form (hirogana, katakana, and kanji) interwoven together and spoken in a utterly confusing way. Their syntax is completely flipped when compared to English. If you were to say 'I like your dog', you would have to phrases it as 'your dog I like' in Japanese.
Anyways, maybe theres something I'm missing out on, heck, I'd love to practice medicine when I get my MD. Something I'm missing out on here?