I TOLD you y'all used to have Phi Sigma Sigma! *to myself: "How come no one ever listens to me? Eh?"*
I don't know much about Phi Sig because we don't have it at UK anymore...it's long gone. But from what I've heard, it's a good organization--it just doesn't get a lot of attention because it's smaller than the big-name groups. Maybe there would be renewed interest in your sorority if people knew that a national organization has expressed interest in colonizing. If I were you, I'd e-mail Phi Sig and tell them that you are interested in bringing a national to your campus and ask if they have any tips. Maybe if they contacted the university, something could be arranged where you didn't have to go through all that establishing a local stuff first. I don't know. It's worth a try, though, isn't it?