If you are going to switch to JR radio, gyro, esc depending on the gyro it can be easy or a little tougher. If your gyro draws a low enough amount of power you can use a JR receiver with a 2-in-1 controller and fly away. If you are using something like a Futaba 401 the 2-in-1 cannot power it as well as the flight electronics. That leaves you with two options use a separate receiver battery or use a combination of the 2-in-1 and another esc like the pixi 20. The setup would be as follows:

You need a Y harness to connect the throttle connection side of both the 2-in-1 and the main esc this will plug into the throttle channel on the receiver. You then need to connect the battery inputs for both esc either by Y harness or just solder them.

You then connect the pixi esc to the main motor and you connect the tail motor to the 2-in-1 leaving the main motor output on the 2-in-1 open.

The gyro connects to the rudder channel on the receiver and to the rudder input on the 2-in-1.

This setup will also allow a brushless main motor by substituting a brushless esc in place of the pixi esc.