I do not believe they are modular. When they were built it was well before the VLS we are seeing now on the Type 052D, or even the Type 054A. Besides, that would mean they need all sorts of new sensors which they are not designed to carry.If an AAW missile was deployed in a box launcher format, I think its possible for the 022 to carry AAW missiles. The missile holds appear to be modular. The bigger issue would be having the appropriate sensors to maximize the effectiveness of those AAWs but the 022 is too small a platform by itself.
No, these things were built for AsuW, with some minimal CIWS AAW self defense. But they are meant to be very stealthy.
As stated, they do not have the sensors for longer range AAW engagements and depend on other sensors through data link to target their long range SSMs.
Again, I do not believe they have anything but SSMs in their launchers.
AAW for them will be limited to the 30mm CIWS, and MANPADS.