You won’t get all the carbs off, but you will get it below the MC meal levels for sure. Can you also ask if they have any unsauced meat in the back?

I’m not sure where you are, but do you have access to canned chicken, tuna and salmon? Or a rotiserry chicken? Or a fast food place with a weekly burger special, like Brahms has 5 burgers for $5 on Tuesday where I live. You can buy them and ditch the buns and have meats that way.