Hi moshi,
Option Two sure sounds interesting but there are quite a few questions arising from that.
First of all, how is your Japanese? Would you have to take the exams in Japanese? Would you be able to radio in English, even at small airfields?
Then the question is how the whole industry is set up over there. Is the CFI route practical and possible? Many countries use only experienced pilots as instructors. What are typical ways to land the first job in Japan? Most importantly, how are the chances, what condition is the industry in? You might want to start digging into Japanese aviation forums. Also try to get to know people from the industry and start making connections.
You need to think about where you want to work. A Japanese license will not get you far in the world. You would probably need to convert to FAA or EASA if you want to work somewhere else. Remember, if you want to go with the F1 visa (not possible in Seattle
AFAIK) you cannot be above a certain amount of hours, I think it is about 80.
Another option would be to get you private license in Japan, save some more money and then continue on abroad. Might be the best of both worlds.
Edit: I think an average of one hour per week is not too bad. There will be weeks where you need more and weeks where you focus on studying. Also working two jobs probably won't leave you with many windows for flyable weather anyways.