Updating my old guess:
・SKE48: Rena, Jurina, Masana, Akarin, Shawako + hoping for Kumi, Anna, Manatsu and Kanon probably have a shot too.. maybe even more = ~9
・NMB48: Sayaka, Milky + Others?= ~3 or 4?
・HKT48: Kodama Haruka for sure = ~1
14/64 = ~21% Non-AKB
That means around 45~50 spots for AKB48 members, so I'll go for option 41-48.