In many ways traditions and cultures especially of a culinary nature were erased by apartheid and the so called bantu education act. Sangomas are still.largely used but the info they keep is very guarded.
This is absolutely true. There are many scholars and activists (many now ex-pats outside of South Africa) who are eager to restore access to the cultures and traditions, so you are not alone in your desire, and many of them may be able to help with the knowledge part regarding old ways. It is an uphill battle, but fortunately not totally impossible yet. As the older generations die, it becomes a race against time to recover what has been lost, though.
> I will grow and distribute plants and info free to underprivileged areas and townships that would be very fulfilling:)
That is a wonderful idea! I wish you much success!
> Maybe with enough info I could convince a scholar to write a book on the subject too:)
I'll bet you could. You could contact professors when you have a lot of info gathered, and see if they might be interested to write such a thing, or perhaps they can convince a student under them to do it. Anthropologists, some historians, as well as biologists may consider writing something like that. Even if they only write an article, from such articles come more articles, dissertations, and ultimately books, in the academic world.
If you get involved in helping preserve cultural knowledge, or with helping underprivileged communities, you also have a good chance of getting a magazine or other media/news source to publish something on your project - which can help bring in lots of people from all different types of backgrounds who want to help your cause.
I think all of this sounds like a great idea! It is certainly valuable to identify and cultivate native fruits, for so many varied reasons. All the better if you can tie that in specifically to helping local communities.