As upon searching I found none, that's why OP is concerned that Portugal section is filled with Brazilian people so they deserve another section. I suggest instead of combining these two, Brazil should be given another separate board. That's just a thought because I know how it feels to not see your country in the local boards, we are still missing our country name on BTT.
Actually, it depends. If people are from Brazil or whatever country, the language they speak is still Portuguese. There is no problem with that. The problem is, that the admin picked the Portugal flag for the Portuguese speakers. I don't know what could be a solution here. Let the admin decide what they want to do with that. Brazilian people are welcome to provide their opinions.
If you talk about Bitcointalk, they are completely different. As you may know, theymos talk much less when it comes to adding new boards and recruiting new moderators and merit sources. Pakistan thread has enough number of members to have a local board. But maybe there is something that we don't know but the admin knows.