So I know that, in the past, wen a band has been good enough to keep their country of origin secret, or are too obscure for it to be located, we've just selected International and put note in the trivia section.

In order to bring awareness to this, so that the info may be added if found, would it not be more feasible to create an setting for Unknown? It would only be a small number (At least 5 directly state unknown, a few more are missing any info and would need some research.)