Starting a New Save Should NOT Force You Into CAS

I keep a premade Sim in my library on the gallery. I always download him into CAS as soon as CAS starts up. I place him on the same empty lot every time. He is a homeless man that I cheated so that he can survive well on an empty lot. I think of him as a townie that I always have in my game.

I only actively play him if I am playing a child alone challenge. I start the child with him and then delete him from the family. He still roams around the game even though I cannot actively play him. If the child needs an adult, I go find him and add him back into the family just long enough for him to complete the neccessary task.