Iran has never shown interest in JF-17 officially. Where are you getting this from? JF-17 will not serve Iran's requirements. It, especially in its next versions is a decent jet, but every nations has its own needs.
True, AWCS will certainly be on Iran's list.
The airliner incident would not have been any different if Iran had AWACS. The incident was the fault of not grounding the air-fleet and the lack of IFF on the TOR-M1 system.
I would be pretty surprised if Pakistanis fell for such a silly and comical claim than F-35 had anything to do with that incident. Those attacks were caused by saboteurs, they have been arrested. The F-35 story was invented by a Kuwaiti newspaper known for its make up claims. F-35 is a good plane, but it cannot perform the sort of work being claimed.
Syria is right next door to Israel and given Syria's current situation, Iran did not want to make it worse but inviting more destruction by retaliating to Israeli attacks. The reason Iran does not respond is not because it can't, but because it choses restrain for now. Iran's goal in Syria is to create a new front against the zionists, they know this hence why they're so desperate to stop it, and of course they will fail.