Zeero, I was working on that too.
And it is HELLA hard to confirm. Not just midscreen, but anywhere.
I doubt I'd go for it in a match, because I'm unsure how to even tell if it's guaranteed at any given FCH j.B.
Yes, 7jump, then airdash.
Also, for an easier variant.
B+C > 22D > release 2D > j.2C allecan > 2D hit > vivace A works great.