Like everyone has said, you're wasting your time chasing employment in South Africa. Even getting a SA conversion is not worth the risk and expense, as most ZS aircraft outside of RSA are staffed by South African pilots or a mixture of local/SA's. There are plenty of excellent, well qualified and unemployed/underemployed pilots from South Africa. It's no different from the US. You are least likely to find a job in South Africa or Kenya.
As far as ALS goes, their ERJ's fly mainly for the UN in the World Food Program. Their aircraft are staffed by Kenyans.
Since you've previously inquired about UN flying, here's what I know: From personal experience, I can tell you that UN contract flying is FAR from ideal. The UN operates one of the larger scheduled airlines without owning any aircraft. UN contract pilots do not receive any of the benefits of working for the UN and are all under varying T&C. Not all crews/aircraft are created equal. You are not protected by the UN, nor treated as an asset. Due to aircraft registrations, there are very few Americans flying UN & WFP contracts in Africa. Most CRJ/DHC-8 flying is done by Canadians, some DHC-8 by Kenyans, ERJ Kenyans, B1900 mostly South African, 737-combi South African and a VQ registered 737-400 which is Russian owned, MD-83 which is Spanish. Then there are the Russians who operate virtually ALL cargo flights. IL-76, AN-26, Mi-8, Mi-24 and Mi-26. Occasionally, you will find other odd aircraft types/other countries represented because the UN puts out RFP for every contract every 6 months. The low ballers come in and try to operate for less and then figure out what a money losing proposition it is and bail. UN contracts are not lucrative for single/small-fleet aircraft operations.
If you have an unrestricted ERJ type (NO Circling Limited to VMC Only or SIC Privileges Only) and PIC time on type, there are ERJ jobs - especially in Nigeria. ACASS in Canada would be a good place for you to start. There are probably over a dozen Legacy jets operating in Lagos and Abuja. Some are N registered. Many are Manx registered for convenience/tax advantages and a validation is simple to obtain through your employer.
If you want to work in Africa, or anywhere outside of your home country for that matter, you need to take a pragmatic approach. Consider the area, look at it's needs/growth and what you have to offer. Most regions that are hiring Expat pilots are not mature markets like South Africa. Kenya is another off-limits to expats country. To be a guest in a country, they require experienced, type-rated pilots who can fulfill specific needs until such a time when there is a sufficient supply of local pilots. Nigeria is unique for many reasons which go far off-topic here. Suffice to say it's not for everyone and they will have a long-term need for expats.