Considering how earlier variant(s) were introduced into services at small batches and how hard those outfits clocking flight hours on those airframes, it's more economical and make more sense logistically to bring in whole new variant airframes to unify the entire fleet.
Hard to say if by end of 2027 whether China's own first nuclear carrier will be finished, and whether there will be follow ups for 076.
I'm sure it's doable, but it's still a bunch of busy work for HAIC just so JL-10 has another engine source. It's a question of if that's worth doing vs just going with one of the other five options. Surely SAC wouldn't mind getting that money instead for them to work on a J-15ST, they might even figure out some further Flanker improvement while doing it that's applicable to other Flanker versions too.
