Reset Champion Mastery

This only refers to me. I've had this question in my head for a while. I used to play Vladimir, Taric, Shen and a few other reworked Champions a lot before their rework and I'm simply asking if I can get my Champion Mastery Points reset on those specific Champions, or just do a complete wipe of Mastery Points on All Champions in my roster. To also keep this fair, Chests that I have earned from champions this season will remain as earned.