A-Darter is already in production for the SAAF. So the missile itself is ready, the missing link (applicable to the A-Darter, Turkish GÖKDOĞAN and even Chinese PL-10) is HMD/S.
There aren't any service-ready HMD/S systems on the market besides the Elbit DASH/Targo (the basis of JHMCS/II), BAE Striker and Thales TopOwl-F.
The Elbit stuff is a non-starter (Israel); the JHMCS II is a non-starter (US/Israel); BAE Striker is unlikely; and the TopOwl-F is older technology (monocle system instead of a digital panel. Even India decided to replace it with the DASH from Israel on the Rafale). The Chinese are still working on theirs, no ETA yet.
Personally, I do think the option to acquire the TopOwl-F is there (Pakistan's still buying other things from Thales Optronics), it'll just be a passable system instead of an optimal one.