As you do not have a thrust vector installed obviously, and you have a seperate channel available for the nose wheel, you could do the following:

Set flight modes for bank 1 and bank 2, controlled by the gear switch.
Bank 1 (gear down): All channels inabled incl. nose wheel, higher gain set for take-off an landing anytime the gear is out.
Bank 2: Disable channel for the nose wheel, in your example I assume this is 'E', and set a lower gain for faster flying.

If you would use a seperate gyro for the nose wheel, you would even be able to add the thrust vector and have the flight gains controlled by the flap switch, which would be more perfect in regards to switching the gains depending on the flight condition.

Just as a side note: we do have the same plane here for testing and have the nose wheel not connected at all, simply limited in its tilt angle. The rest is done by the thrust vector on the ground. Rudder is also fix. So CORTEX is connected with Elevon1/Elevon2/Canards/Thrust rudder/Thrust elevator.