You know, I am surprised such an obvious crossover wasn't made before, but better late than never.
Aoi looks great in Sayaka's clothes, and I think the whole Holy Quintet could be done with Starlight Academy girls: obviously Ichigo as Madoka, Otome as Mami (with a nice twist regarding age since Mami is older than her teammmates while Otome is younger), Ran as Kyouko and Mizuki as Homura (with a reversal of the colors since Ran and Mizuki are respectively purple and red in Aikatsu).