Maybe things are different with Japanese immigration authorities, but posting this feels dangerous.

In other countries there's a lot of attention on "fraudulent" visas, and it's often vague what "fraudulent" means. I'd be worried that some of the 'tricks' in here (the admission that the business doesn't really need to be in Japan, the office arrangement, etc.) could make immigration authorities revoke the visa if they feel it was done under false pretences.