I just got past this length a few months ago...as soon as I could pull my hair into any kind of pony/bun(although very tiny), I started using my phony ponies or weave to make a bun...
I had to use bobby pins to hold the short peices, but it has definitely helped me ps and not have to get a relaxer the last 3 mos! I also do braidouts, flexirod sets, and just started doing perm rod sets.