How to customize the title on the navigator screen to include the security group?

We have 8 different business groups defined, which correspond to 8 different security profiles in the HR application.  Some of the users have access to multiple of the security groups.  In the past we always created different responsibilities for each business group and named the responsibility so that the user was able to see  which business group they were working with.  Now we are using 1 responsibility, but utilizing the security groups.    There has been a request to somehow customize the title on the main navigator screen so that the security group (or business group since they are a 1