You should download Part 61. 61.01.14. print it out and then read it in the bath.
Perhaps you should read what it says about converting a validation. (para24) and also what it says about allowing South African citizens to convert foreign licences (para 2).
Note that there is a very difference between validate and convert.
Let me tell you right now that there is no confusion at CAA. They are operating really quite well. The exact wording of Part 61 is being adopted with no flexiility so that within Part 61, everyone knows precisely where they stand.
For instance....
If you go to 61.07.7.(1)
The holder of a ATPL shall undergo a revalidation check within 12 months.....
This is why, although your ATPL is valid for ten years, it will be stamped on the ratings page that it is valid for one year.
There used to be no specific check ride for an ATPL renewal, the IR renewal covered that. Now, in theory I guess(?) you do not need an IR for an ATPL to be valid - but that is pretty much an academic thing?