I wouldn’t worry about the menus, I flew to JFK in UC and back a few weeks ago, with a 9 yr old who has dairy intolerance. I booked a dairy free child’s meal for both ways. She ate in the CH before we boarded. Once on board her meal was served which was mac and cheese, even though I’d stated no cheese ! The FSM said that on the US routes children’s meals almost always consist of some sort of cheese dish
The crew were brilliant they accommodated her by making up a meal from the different options avaible on the main menu.
On the return we ate in the CH, and again on board the crew made up a meal as again it was a cheese based meal.
She had steak, potatoes and baked beans from a different child’s meal, she said it was the best meal she had ever had

.
So order a child’s meal, and if it doesn’t suit the will be lots of other options.