I'm attempting to use Drupal 7 with organic groups to create a network of groups for local affiliates of a national organization. Initially we want users in each group to be able to post private content inside of the group, which is not a problem. However, since local affiliates tend to share ideas and files we'd also like a group administrator to be able to "link" their group with another trusted affiliate so that users of the two affiliates can have access to the content in the linked groups.
I realize the people in each group can be added to other existing groups, but as far as I am aware this is on an individual basis and thus would not be sustainable going forward as members that are added and removed from their primary group would not automatically have their membership changed in the other affiliated groups.
The closest thing I've seen is http://drupal.org/project/og_affiliations but it's no longer being updated. I was wondering if anyone has any ideas for approaching this setup or if there might be a better solution than OG that I'm overlooking?