UAE supposedly bankrolled a large portion of the development for the initial FC-31 project by Shenyang according to Yankee.Selling to any Arab country for the foreseeable future is just like handing a few units over to the Americans for evaluation, imo. Except Egypt.
If their government specifically does ever want to finalize purchases down the line, rejecting that outright will likely make for contractual headaches at the very least and could reduce the credibility of how the region views all Chinese military arms deals in the future.