Confusion in relationship of subgroup to parent node

Hi,

I'm having a subgroup dichotomy which may have nothing to do with this module directly but which someone here may be able to give me help with.

I have two group types on my site, Clusters (parent groups) and Case Studies (subgroups) both are set to group type posts and there is a Create Case Study link in the Group details block courtesy of OG User Roles.

The home pages of each group type are created via Panels and Blueprints with each panel on a homepage containing a View which contextualises the list of content (including subgroups) within the group in which it was created.

When an admin decides it's time to close a Cluster parent group all the other content types can be moved to a new or existing Cluster group using the 'Group' box on the edit form but as Case Study IS a group there is no such box. Changing the group hierarchy makes no difference as it's the View context that controls where the Case Study is displayed.

Is there any way of changing the audience for this subgroup so that it can be displayed on another Cluster's homepage?