The biggest problem we could face or may have already faced with regards to acquiring SU-35 would be the option to choose avionics and missiles of our own select and that would be most probably chinese origin since Russia is lagging behind these days.
HMDS, BVRs, HOBS WVR, AShm and strong AESA radar especially since SU-35 has powerful engine and good power output, we can even try to get J-20s radar which has around 2200 TRMs reportedly.
That would be the deadliest machine in sub continent if something like that happens.
Imagine, A SU-35 with very low RCS, housing a J-20 radar, mounted with 8 PL-15, not even rafale could match such thing !!!