Wouldn't the tankers draw off some ROCAF fighters for escort duty if the SAM network gets too degraded/depleted by continued SSM saturation?
The Harriers seem to be getting a bit long in the tooth. And I'm not sure of their desirability for anything other than interdiction of amphibious PLA forces (A Harrier fighting with a J-10 sounds rather one sided), which could be done with MRLS or attack helicopters.
Harrier is a big big mistake.
It is a logistical and a maintenance hog.
It has a very high attrition rate---at least 45 Marine aviators have died on it and many more maimed from it.
It has poor flight performance. For a plane with an enormous thrust to weight ratio (every big as good as an F-16), it cannot hit supersonic in a straight line.
It cannot VTOL with a significant load. Thus it still uses a runaway like everyone else.
VTOLing tends to cook the pavement, making tha section of the asphalt, unusable. Harriers would wreak havoc on highways.
Its enormous front intakes means BIG RCS for an early detection by the enemy followed by incoming radar missile.
The use of thrusters in the middle of body reduces its survivability against infrared missiles, since it puts the heat source right in the body center, as opposed to behind the aircraft.
It requires significant training to master. Your pilots need to master helicopter flying skills too. On VTOL mode, the jet is more dangerous and difficiult to handle than a helo.
If the ROCAF wants to help the PLAAF defeat itself faster, by all means, get Harriers.