I had a rueful chuckle over your comment about only a few South Westers joining the Nazis before the war. If you go to the Lutheran church in Luderitz you will see remembrance boards celebrating scores of locals who fought for Deutschland (particularly on the Eastern front) who were killed during the war. Based on this small sample, I would suggest that there were thousands of Namibians who fought for Germany during WW II. A fascinating topic to investigate; although unfortunately most of these lads (and perhaps frauleins) would be dead by now.
I’ve been trying to get a fix on just how many went to on the German side, but records are no longer available, fascinating subject indeed.