I do not believe there is any way to automate this.  You could try using a Lifecycle project, create it as a blank one, add in all your existing project area containers (don't use the lifecycle proj creation to create any project areas).  Once they have all been added you can then add users, it does have a way to expedite adding the user/s to all the project area containers and then you can manage the user roles individually in the lifecycle project user manager area.

For team areas your stuck manually managing them.  Easiest method for that might be to offload the task of managing members for them to team leads. Give the tema lead role (whatever that is in your process config) the ability to modify and manage team areas and they can then manage individuals in and out of them.

-Chris