@tcha Since you are in SA already, once SA starts accepting applicants for state sponsorship maybe you can check if your occupation is in their list & what the requirements are for 190/491 state sponsorship. If you can meet the requirements, I suggest you just go for that since that's a sure way to PR & you don't have to stay with your current employer for 3 years before you can secure your PR pathway.
Note though that the slots for some occupations fill-up quickly, they're gone within a few hours after SA starts accepting applications. So it's best to have all requirements on hand so you can apply right away.