I think the Turks froze the general design of the TFX. Remember, they contracted BAE to help for a few years (and I think the help is ongoing), so changing it beyond marginal stuff is an added cost. If the PAF is genuinely interested, it'll have to sign onto the TAI/BAE concept.
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That said, there might be some room for flexibility re: the engine.
The TR Motor powerplant will likely be far out, so if a big PAF order rests on integrating WS-10 or AL-31, the design of an 'eastern-ized' sub-variant might be tenable.
Ironically, ordering the J-10CE may open the door for the TFX. If the PAF thinks the J-10CE can deliver on its needs for the 2020s and early 2030s, then AHQ may be good with the risks and timelines of the TFX. Obviously, the TFX is ahead on the development curve compared to AZM, but it's still an original project, it has risks. However, if the TFX runs into snags, then the PAF will lean on additional J-10CEs. Until India introduces a FGFA, the J-10CE should be a credible asset against 4+/4.5+ threats.
IMO, the PAF's target fleet mix for 2047 might be:
- 90+ TFX
- ~150 J-10CE
- ~188 JF-17s