There are several options, but these are the ones that come to mind.
Option #1: Stretch it to spin 606/96 blades on 12S. Change the tail ratio to 1:4.5.
Option #2: Keep it as a single LiPo setup spinning 556/96 blades, but change the electronics. Different FBL system, maybe 7S LiPo, different motor (KDE-1100), etc.