I have to travel for my work too and generally try to keep food simple: recognisable items minus the sauce for example; as I may not be obvious what it contains and what it will do to your BG.
Breakfast buffet usually lets you pick and choose for yourself or order an omlette. Salads with dressings on the side, steamed veg, grilled fish, chicken or steak. I also hit the local shops for snacks like raw nuts.
Most places I find very accommodating for their customers needs.