Sounds like China's version of Red Flag Exercise.
Overtime, PLAAF should invite some foreign air forces to participate the exercise too, starting from PAF.
What makes you think the PLAAF isn't doing that already?
There have been pictures of PAF pilots with PLAAF Su27s, and with the number of Chinese and Pakistani fighter pilots in each other's country pretty much all the time, I would be amazed if there was not a broad and deep exchange of ideas or even mock dogfights.
The PAF has a lot of exchanges and exercises with NATO members and gulf state air forces, so they are pretty much on top of the game when it comes to western air combat tactics and doctrine.
While there is no substitute from actually having exercises with NATO air forces, practicing with the PAF would be pretty damn close, in addition, with the PAF, the PLAAF does not need to worry so much about potential adversaries learning about their tactics and signature moves. Even amongst the western allies, they can be friction about some members holding back and only participating to learn the tricks and capabilities of others. Just think back to all the American complaints about the French scooping up signals with their Rafales while not emitting anything themselves.
That means the PLAAF would be able to cut loose more and give it all they got with the PAF, instead of having to worry about holding back and not tipping their hand as they would if they practiced with any NATO members, since you be bet your bottom dollar that if the PLAAF actually had an exercise with a NATO member, as soon as the exercises was over, all the other NATO members will come over and they will all dissect everything the PLAAF pilots did and tailoring all subsequent inter-NATO exercises on how to counter and defeat the PLAAF.
Why would China want to give NATO such a heads up when the PAF will happily teach them about NATO tactics and doctrine with almost no risk of NATO learning about how Chinese pilots fly and fight?