Are there any plans to upgrade the J-11A?
They've already had an MLU in the early 2010s to keep them flying.
But the small number of J-11As and the fact that they weren't using Chinese avionics and weapons to begin with, coupled with their much older age, means it wouldn't be worth it to upgrade them.
A similar rationale probably exists for the MKKs.
The Russian origin Flankers are probably worth keeping around until they literally run out of flying hours, and upgrade them moderately with some EW pods, maybe some self defense sensors (MAWS or something), and integrate some domestic weapons if feasible (e.g.: PL-12s onto MKK/MK2s), but giving them AESAs and compatibility with full PLA weapons suite is likely not worth it.