Hi
I am not sure if its from this parish, but my first forefather came to South Africa as a 16 year old , William John Locke, This was around 1818-1878, he was one of the first settlers to go to South Africa, wonderid there is some ship records of the 1820 -1830 ships that went to South Africa.
Regards
Hendrick
Dear Hendrick:
Welcome to Ireland Reaching Out!
You may find some helpful information through Family Search at the link below that is specific to South Africa:
https://www.familysearch.org/search/collection/location/1927115?region=South%20Africa
For passenger lists to South Africa from the UK, there are several links:
http://www.searchforancestors.com/records/passenger_tosa.html
https://www.geni.com/projects/British-Ships-to-South-Africa-in-the-1800-s/16190
The best of luck with your research.
Kind regards,
Jane