One thought is:
Start with and let your weight pressure remain on your left side. That way you are in position to strike down on and hit the ball first (as opposed to hitting the earth first). Being in this position, the right wrist will have no desire to flatten.
Use a headcover or something similar and place behind the ball about 15".
Start with some short chips and gradually work back to some pitches, with care to not contact the headcover either on the way up or down.