Hey angel...look bro, after these surgeries you do not have much stomach left and it can only be filled with small amounts of food. The aas would not help, especially if you are one of the guys who gets extreme hunger from aas. You would have yourself in a bind....needing/wanting calories but you can't have them.
I would stick with following the exact diet they give you, do sarms, and keep your eca/phenbuterol stack going. Be sure have supps to cover all vitamins and minerals
Take it all slow because these surgeries are not a miracle, and still require discipline.