How does one suggest a makeover?

[GGirlEC]

I'm a member of a local sorority on a small campus. Our sisters continuously serve as leaders and contributors to our Greek community, and maintain strong relationships with the two national sororities also present on campus. However, our organization's lack of national connections and history is serving to be a turn off to PNMs, greatly lowering our numbers. Given the time our sorority has existed (we're talking almost twenty years), it is definitely not as developed as it should be. Our rules continue to be wishy-washy (even by local standards) and basic details like cheers are still missing. Currently our members display no interest in working on this.

Basically, what I'm wondering is how one would propose revamping and solidifying our sorority, even going so far as to seek affiliation with a national organization, in a way that would least offend everyone. Has anyone else been in a similar situation? If anyone's sorority has chosen to become part of a national organization, how long does the process take?