China is not inclined on giving ToT of high strategic assets otherwise Turkey would have bought the HQ-9, it wanted some amount of ToT that China wasn't willing to give, everything else was fine..price, performance and capabilities wise..
This is happening with the J-31 too, or we would have seen some interested parties investing in it and going for JVs.. but it is not too late, some middle eastern countries
(minus UAE that went for a JV with Russia, although for a light 5th generation, so we shouldn't count it out, since the J-31 is medium weight)..might still be interested if China offers some ToT, assembly and production possibilities, but there ought to be a finished product to start with..