Groups of Supporters

I have a situation that is probably not different from edublogs: My supporters could be individuals/students, or they could be a group with a leader/teacher/administrator that is responsible for a single larger monthly payment.

For example:
$10/mo for an individual supporter
$100/mo for a group of up to 25 supporters

Right now, I can handle the billing, I'm just not sure how to manage the users. Near as I can tell, there is no way to associate the users such that I could renew their supporter functions as a group when their billing period is renewed. Could the "Blog and User Creator" plugin be useful in this scenario? If so, does it integrate with the functionality of the Supporter plugin?

All advice on how to deal with such groups is appreciated!