It's kind of funny that a light fuel and weapons load on a Flanker will probably make it as capable as a fully loaded Hornet...
It wouldn't be that hard for them to convert their Flankers into organic tankers if they haven't already. Now I don't know how much give they would have, but those are big engines, and they don't have to do cyclic ops.
I am not sure you all realize just how much they lose without a catapult even with the Flanker's big motors (and are they using the 'weak' Chinese engines or the better Russian ones?). As jcmquate already pointed out their light loads would likely preclude them being able to use them as buddy tankers for more than just a photo op. Simply put, without a catapult all the Su-33's and J-15's are good for is point defense.
To paraphrase the late great VADM Connolly, all the thrust in Christendom isn't going to make the Flanker a good carrier fighter without a catapult.