... most Production shooters will use a "stripper" or "barney" mag and then remove it and replace it with a full mag so you are starting 10 +1.
Why not just have one mag loaded with 11 so that after LMAR you are 10+1 without the extra mag change?
I put 11 in the mag furthest from the front of my belt, use that upon "make ready" to get me to 10+1 at the beep, and then all the other 10 round mags are more readily available to me on my belt. All I have to do is be very disciplined about the mags. I load everything 10, then one of the last things I do prior to range hot is to put one more round in that last magazine and when my time comes up I always "make ready" that last mag.