If I were China, I would not give J-35 to Pak unless I also give them the means to protect these, both on the ground and air.
Such as an active protection system against drones near hangers (microwave and Trophy like system).
Similarly, China should provide (sale or loan) some defence equipment against Brahmos-type assault. It can be medium-range missiles (we have FD 2000 and HQ7, but not sure if these could prevent supersonic CMs) or some good EW and a Microwave fryer.
The loss of J35 (even export version) is far far greater than the success of shooting entire IAF Rafales.