Nonstandard human ethnicity + region mixture okay?

I saw the rules for having access to 2 ethnicities or 2 regions, but I couldn't find any clarity on whether it was okay to just have a character of an ethnicity that is not at all common from their region? The specific thing in mind I am looking at is to have a Nidalese ethnicity character with the Alkenstar region, story background being his parent were immigrants there so he was raised in Alkenstar.

The obvious mechanical benefit is the combination of access to Nidalese feats for low light/darkvision and firearms.

I don't believe there's any rule that prevents you from taking any combination of an ethnicity and a nationality.

There's no rule that prohibits you from creating a Bonuwat human living in Alkensar.

You don't gain both "Home Regions" (Mwangi Expanse and Impossible Lands) unless you take the boon for a second one. You need to pick which one you start with.

However, you would qualify for things that required "Ethnicity: Bonuwat," for example, regardless of which Home Region you selected.