The transmitter can give you all that you want.

Use the Aileron Diff function for two of the aileron servos...one left and one right. You would then use a "Y" harness for the two left-hand servos, and a "Y" harness for the two right-hand servos. Or, after you set up the servos on the Aileron Diff function, you could then use a mix with Aileron as Master, and a second left aileron servo as slave, and then another mix with Aileron as master and the second right aileron as slave. If you use two point mixes, you'll be able to get the slave servos to match quite closely to the master servos.

Two elevator servos are operated through the Ailevator function.

You would use a Pmix with Rudder as Master and the second rudder servo channel as slave.