We have less restrictions at our house, but still work around DH eating a Keto only diet (due to a nickel allergy - removing basically anything not allowed in Keto has the same effect as avoiding nickel), two teens who need a lot of calories due to sports/activities/generally being active teen boys, and me. Who would like to drop 15 lbs, and generally eat a lowish carb diet, with healthy options.
We bulk cook, but approach it slightly differently than you. For example, I might bulk prep (or, buy, I buy a lot of options for DH at Trader Joes) cauliflower rice, regular rice, & taco meat, & then I'll use all of those versions for various eaters. So, maybe you are bulk prepping your own food one week, and pulling it out & serving it at the same time as a bulk prepped item you made a few weeks ago for your kids. I guess what I'm saying is I wouldn't be interested in starting from scratch cooking three meals a day (x3?), but maybe move towards a place where you are warming up different options for folks, all of which have been bulk cooked.
Meals we often customize:
-Burrito bowls
-Chicken shawarma (bowls or with naan/pita)
-Customizable salads (served with fresh bread on the side for carb eaters). Salads have a variety of toppings + protein, and folks can mix/match
-Spaghetti & meatballs. Everyone can eat the meat/sauce, and the teens & I eat regular pasta, and DH has "Healthy Noodles" (that's the brand name - they are soy noodles & take 2 minutes to prep). Could adjust to a variety of sauces/proteins.
-Homemade pizzas (one with cauliflower crust, one with regular crust). Everyone can tweak the toppings
What's helped me the most is bulk prepping proteins. Having that at the ready, and some easy/healthy sides makes it easy to throw meals together. Then, I have "add ons" for the teens. Extra pasta, bread, etc that they can add to fill out a meal.