@Dimitri *******
The person I am asking for has a foreign company that immigration is aware of and so far has not had a problem with. "So far" is the key, though. The goal here is to figure out a way to ensure full compliance. The person has kids in school so wants to ensure there is no reason he can be kicked out at least until the kids finish school.
Are you suggesting to get a foreign business license in Thailand? It seems that in the same decree mentioned, representatives of a foreign bussiness also do not need a work permit. From what I'm reading, a foreign bussiness license looks even harder to obtain, though.