I see a lot of the lazy feet sickness even in experiance pilots. What I have found to help is the old yaw string. I find it keeps the pilots eyes out side and not inside watching the T & B or turn coordinator. They instantly see the quality of their turn.
I teach in Citabrias and gliders which require the use of rudder. If a pilot has trouble with cooridantion we try several roll in to and out of 45 degree bank turns. I have them switch direction after about 30 degrees of heading change. Have them start out slowly and gradualy increase the roll rate. People will get so engrossed with the turns that they let the altitude go. So you will have to remind them about pitch control.