wow I think your answer was great. this is exactly how I deal with my SI (I no longer cut) I don't tell my T when I do it because it is kind of a personal thing IRL but I doubt she would ever ask me to stop.
I no longer SI out of routine but I do when things feel completely out of control and or when I feel I deserve it .so it can be done and it is a great reachable goal although difficult to achieve. i wish you well. I think it is a great strength to know realistic goals