I'm just reiterating what my sister Carrie said in the previous post. However, Carrie is much more ladylike and restrained than I am!
These girls are definitely going to be mildly unhappy that you want to bring another NPC group in. Up until now, they have no competition for boys, pledges or anything else. In other words, they now have free reign to be as obnoxious as they want to because they are the only show in town!
Sounds to me like they need a good dose of panhellenic reality; let them sweat a little during bid matching, ya know?
Wishinhopin, you're such a fantastic, brave young woman. I know how hard it is to bring about change! But what you're doing is a great thing that could have a lasting impression on your campus. Big burden on one little pair of shoulders, but I have a feeling that you're going to do just fine! Best of luck to you