Since your campus appears to be open to a national sorority (and some are international), I would start up your group with the intention of going that way, and contacting NPC may actually help. They may know something about your campus that you don't and the administration there didn't tell you, like it's been tried before and failed. Or not. Maybe an NPC sorority would be interested in going on campus if they know there is support there.
You might look through the NPC recruitment results thread and find some campuses that only have one NPC sorority represented and see if you can get more information from them.
Try this
http://www.greekchat.com/gcforums/sh...ghlight=colony
which is on a different subject but might give you some further research ideas.
And you have to understand the stupid questions we get here on GC. It's pretty easy to assume the worst.