What about using them as one way range extenders? A J-11 could extend the range of a missile and maybe a couple decoys by ~2000km. It might be cheaper to just use longer range missiles, but it could also make a lo-lo-lo profile missile into a very long range one.
You need the networking to make that viable, and at the end of the day you're probably still better off with a dedicated UAV for that role unless one is happy to simply use the converted unmanned J-11 as a glorified suicide drone.