You need to believe that clipless will provide you with the best pedaling experience possible and is SAFER because your feel can't slip off the pedals inadvertently and you can apply max power to the pedals whever you need it (maybe to avoid a hazardous situation). Beyond that, just keep practicing until twisting out becomes the automatic response to stopping. Maybe ride a flat 2 mile course and twist out every 20 pedal strokes daily for a week. It's a matter of doing it so much that your brain becomes hard wired that way. It will happen. Keep at it. Big rewards.