One of the fraternities at LSU has shown this to work. When they came back on campus, the alums worked really hard in their own home towns. They hosted parties and invited ALL PNMs, no matter where they planned to attend college. With their help, the guys were educated on the fraternity, hung out over the summer and eventually, the greatest percentage pledged together. The chapter at LSU has returned to a large membership with a close brotherhood.
I don't know if it would work for a sorority. I have seen "clumps" end up in the same house, but like
AOIIBrandi said, COB might be the most likely situation.
I've always wondered why this wasn't persued more. It seems so logical. Yet, thinking of another thread, maybe finances comes into play. Some parents and/or young women are willing to pay whatever the price tag for membership...in the "right"

sorority. When it comes to paying dues to a chapter without the campus rep, they MAY weigh the cost against the benefits. I don't think the average PNM thinks, "I know I will find true sisterhood in a sorority." I think what's on their mind INITIALLY is the social aspect. If the social isn't there, it's a hard sell.
I tried everything I could to get my friends to consider AXO. They had nothing to gain.(IN THEIR EYES) Because they dated SXs they attended their functions. TGIFs were hosted by a different fraternity almost every other week and they were OPEN to anyone who wanted to pay $2.00. MOST important, we were really close with the girls in our dorm, even had their own team for Derby Days and Powder Puff Football. They had what I had for free.