Your reasons for homesteading are valid at any scale! Being in an apartment just means your homestead has a different look. You have your apartment -- and you have your entire region, whether you'vegot a community garden or forage around your region. My dad always says, "If you can't cultivate a garden, cultivate a friendship with a gardener!" Happy homesteading!
A-men! Cultivating friendships is probably most important, as you are bound to need the help of people with all kinds of expertise at some point. It's all about relationships.