Look at the glycemic index to choose the best foods for your ketogenic meal plan. There are websites that provide the glycemic index (GI) or glycemic load of different foods. The glycemic index tells you how your body's glucose and insulin system will respond to different foods. Foods that are lower on the index (or have a lower glycemic load) are foods that digest more slowly and will help you to feel full for a longer period of time.
As for branched-chain amino acids, you'll find smart people who swear that they're keto-friendly, and others who don't. One of the BCAAs, valine, can be glucogenic, meaning that it can lead to glucose production and potentially contribute to leaving ketosis behind. But does that mean it will happen? Not necessarily, particularly if you're just an occasional supplement user.
Doing a 1:1 substitution would probably change the macros too much but that doesn’t mean that you have to eat dairy to eat a ketogenic diet. If you want to use the meal plan you’d have to adjust it with other sources of fat so that you match the macros. It will require a little work (I recommend using an online diary like MyFitnessPal for support) but you’ll end up with a plan that works for you and your needs
Another trigger of insulin is large quantities of protein. This was one of the issues with the Atkins diet. The optimum amount of protein per meal is about 3 to 6 ounces. Protein is needed for repairing and providing the raw material for muscle, tendons, joint cartilage, and even bone. Protein can also be used for fuel; however, too much protein triggers insulin which can be converted to sugar and then to fat.