Who administers DNA tests? I wouldn't have the first clue of where to go here in Johannesburg, though of course I haven't ever looked. But I do think I would have enjoyed those lectures you speak of, they sound fascinating. It also sounds that you really enjoy your continuous research as a genealogist which is never ending.
Imagine the 'imaginary' genealogy trail that could be done on the soapies and the shenanigans they all get up to! Now there might be a way to catch out the script and story writers ... though that is a completely different subject. Anyway.