If South African employers compel Muslim employees to vaccinate, will it be permissible to be vaccinated.

Answer

If one submits to the demand of the employer and takes the devil's potion (vaccine), then while one will not be sinful, one will still have to suffer the evil / harmful / horrendous consequences of the vaccine. Whatever harmful effects there are, will remain.

Furthermore, in terms of the Shariah, 'compulsion' by the employer is not valid compulsion. A man of Taqwa will rather be prepared to lose his job and struggle along. Allah Ta'ala is the Provider. Our Rizq has already been ordained and it will reach us some way or the other. The employer is not our raaziq. The employer in the context is the agent of shaitaan. The fear of losing the job and the complacency to work under the yoke of kuffaar are the effects of weakness of Imaan and lack of Yaqeen.