Normally no, I don't use my carry gun for carry optics, either in IDPA or USPSA. It doesn't matter to me for several reasons.
Number one, these are sports. Both of them. Neither is training nor practice for self defense.
Number two, the practical marksmanship skills that one does gain transfer to any pistol one later picks up. At least in my own experience.
Number three, my carry pistol is the mid sized version (CZ P-07) of my CO competition pistol (CZ P-09). And the competition pistol, while still modified, is a lot closer to stock than most.