I think an alliance system would be fairly simple... allow two FC's to form an 'alliance' that provides an 'alliance channel' that all members of both FC's can see. Sounds like you wouldn't care for it to be read only except to officers, since it sounds like delegating communications to your officers isn't ideal for you (though I would have figured that would be a given in order to help keep such a large community organized to such a degree), but personally that would be nice to have at least an option for to avoid the possible text cascade.