Tim,
Noting the very realistic advice from a number of our colleagues, I am sure you are minded to take their advice and continue your research. There are naturally major challenges and issues in trying to operate, but nothing that is not impossible to overcome with a good business plan, sage advice and determination + luck of course mix with a few prayers!
Very happy to offer advice and meet up in UK or SA as based in both countries, I have direct access to good aviation business contacts who can provide you with all the operational and business advice you need. To note and as highlighted in every post the SACAA is a nightmare to navigate these days, but viable with the right support.
Sun Helicopter is also well worth exploring as are others.
Good luck with whatever to choose to follow.
Chris M
[email protected]