It likely will not be a problem to swap those or even increase the cream to 4T. His answer was usually try"X" for a month, if you stop losing weight when you return, then X will not work for YOU. Personalization is fine if the client accepts the resullting progress..or reduction thereof.
By measuring veg and the extras this ends up around 20g total carbs. No calorie or carb counting to make this as simple and consistent as possible for study participants.