Bluecat is well aware of the trials and tribulations of this, and has been through hell even trying to get a student visa so he can properly study there. I think he would be find in japan because he actually does respect their culture, their language, etc and working full time for a japanese company is not the only or at least not the only realistic option for one to take. He can of course attempt to gain a visa as the owner of a japanese based company, and making above the necessary levels of revenue to stay in the good graces of the government.
Beyond that, get a japanese woman to actually like him enough to want him to stick around? It's not impossible :3
Now I am not trying to rebuke your rebuttal as something unfair or uncalled for, frankly these are all very natural criticisms of the idea, and a real showing of how utterly strict Japanese immigration is. However, while Bluecat is not here I think its proper someone who understands his motivations, and knowledge on the matter, come in to speak on his behalf if the conversation is to continue.