One hour of training mode later...
I was only able to get three loops on Akiha. The timing gets incredibly difficult by the end of the second rep, and the damage was so so (about 4.1k without a jump in). On the bright side, I found an alternate method without having to resort to 2AAA 5AA, which is awesome.
You can do the tk j.236B > 5A 22A into the loop. That makes it much more simplistic to execute in matches, imo. You can probably stick in a 214A_214C > air combo in there somewhere most definitely. Not sure how yet, need to test it more. I stuck in the rekka enders instead to get a forced knockdown into oki for about 4451 damage on Akiha.
tl;dr
2A 2B 5BB 5C 2C tk j.236B > 5A 22A > 2C 3C 22A > 2A 2C delay 5C 22A > 2C 3C...
Tested it out (this is without a rekka ender, though, I think the damage added would be pretty negligible anyway.)
~3 reps on V. Sion did 5.1k (23 hits)
~4 reps on V. Sion did 5.3k (30 hits)
~3 reps on Akiha did around 4.7k (26 hits)
~4 reps on Akiha did 4.8k (30 hits)
And for comparison, a standard corner bnb on Akiha does 4.5k
Not sure if you can do more than 4 reps. Damage scaling rapes you after the 3rd rep or so. Also, if this is like MBAA, then having it be a 30 hit combo gives your opponent like a million meter, so it's probably not worth it to go over ~20 hits or so.
Edit: think I miscounted my rep numbers. Adjusted my numbers to reflect that. I'll probably retest this stuff when I'm less lazy.