Poor Finland. An average of the climates of Lapland and Ovamboland would probably be really nice, and quite fertile. Instead there is nothing to do but toil and plot revenge on whoever inflicted this colonunon them.
Constant toil, feeling depressed and planning revenge on someone is the default state of Finns IOTL. So, not much change there.
Wonder what the Portuguese would have to say about that?
Surely some kind of a deal could be arranged. Even if a colonial war between Finland and Portugal over the right to use the Cunene River would be a funny little AH scenario to think about...