IMO ... I wouldn't undercut the Chinese on electronics. From what I understand, you can get tier-1 stuff from China provided you're willing to pay for it. The question is if the Chinese have reached a level of efficiency with tier-1 stuff such that they can price it lower than the competition. It's at that point you'd go to the US or EU for finding a better priced solution (relative to performance). But the Chinese can do it, IMO.
Also, from what I understand, the hardware stack is but one part of EW, there's also the threat library and some other elements I imagine. The latter may have more to do with the end-user than the OEM (unless the OEM can and is willing, like the US is with some of its goods).
Ironically, perhaps, India and Pakistan are both in a position to offer some compelling feedback and data (for the US and China, respectively). But the Europeans will want to know about every party involved, which is why they will keep their doors open to Pakistan, provided the money is there to keep the conversation going.
Anyways, the end goal is to create the best package possible, and ideally, we would want to include the areas where the Chinese excel at just as much as those of the Europeans, Turks, etc. We want to avoid end-to-end 'stacks' (like the radar and weapons coming from the same source, be it China or France) and make a custom grade suite that works best for us (with back-ups in place in case one source fails).
To be honest, the only thing keeping me up at night about the JF-17 Block 3 is literally just the HMD/S. I think there's a good-enough or great solution for every other subsystem (incl. AAMs) available or in the pipeline, but the HMD/S is a weird mystery. It's one of those rare situations where one company somehow took 90% of the market, and very few are bothered to work on the underlying technology outside of that company.