How about F2,3? I never have used F2 by itself, I was just comparing it to the properties of B1.
If I understand you correctly yes you can hit confirm B12 into reg flipkick on hit, and on block you have a number of options, including EX flipkick.
Cassie can actually punish her own B12 with reg flipkick, not much to to with this, but I thought it was interesting.