I find solace in watching videos of professional drivers driving NSX-R. If you observe their heel/toe, you will notice that they too have the same problem when compared to the "normal heel and toe" driving.
In a stock NSX, most drivers will have their heel resting to the left of the gas pedal and using the gas pedal at an angle of about 45-60 degrees from the floor. This is in part due to the small pocket in the flooring that rests one's heel away from a perfect line-up with the gas pedal. Once you foot is resting there, it is almost impossible to do the heel and toe by the normal rotation on your heel. Look at the videos, they all lift their right foot and then press the brake pedal at a 45 degree from the floor and then use the heel to blip the gas pedal.