Finned vs smooth brake drum

I think it could but not really sure (I am not actually Spanish but Finnish, just living mostly here). If it could, then it would be subject to annual inspections with the emission tests which I am afraid would fail. Cheap insurance also is kind of appealing.
It depends on what standards they test to. If they test to 1963 standards, I see no reason why it wouldn't pass. I don't see how they could hold it to 2022 standards. But then, I don't know anything about Spain. My niece lived and worked there for a short time as part of her higher education, though.