--With experiences of Su-27, J-11B, Su-30 and J-15, to "REing" another "flanker" look-alike would not be as difficult as people might think of even without one Su-34 in hand, I pressume?
...a bit like if one who's been making burgers for Burger King for ages surely could take on that of McD given a notice(granted, it's not as simple as making burgers, but you get the drift), especially with the help of ample wind tunnels, supercomputers, a truck load of $$$ and, above all, SAC's irresistiblely age-long reputation of stalking Flankers as if there were no tomorrow, no?
Don't get me wrong, peronsally I think Su-34 is a far better option for the moment.
... Well there is supposed to be a strike-flanker project called J-16, kind of like a souped up MKK, which could provide near Su-34 capabilities.
But there's no reason for PLAAF to go out of their way to go for a plane like Su-34 (do they even need it?) when SAC can come up with their own strike derivation of the flanker themselves.