Training a nose wheel pilot to fly a tail wheel airplane is mostly an exercise in controlling yaw on the ground by the use of rudder.
I spend as much time as it takes on the ground to get them used to controlling yaw.
This involves slow speed directional control and loss of control, then we use the runway for high speed runs down the runway with the tail in the air, once they can keep it straight then we learn to S turn down the runway.
When they have that all sorted out we go flying.