The low 2CC > IAD j.B > j.C > 2CC is character specific. I tried it on Relius and Hakumen and it worked, so I'm guessing it works on Tager too. It did not work on most of the other characters I tried. Also, I do not believe it is that hard.
Forgive me if this was posted earlier by someone else but I've found something else too.
22B does indeed have more untechable time than 22C, but we can use this to our advantage. In the corner, if you end the combo with a 22C, you can immediately go for a meaty unblockable afterwards and it will hit the opponent if they decide to immediately neutral tech. Of course this also makes it easier for you to OTG the opponent with a 2B if they opt to try to delay their tech. This is less effective with 22B of course because the untechable time is longer, so you can use that time to get a little more charge, plan further pressure etc. I'll add this to the unblockable setups compilation. 22A has the same untechable time as 22B but is not recommended as the recovery of that special is longer than the other two.
In addition, the j.236D (orb) > j.214D crossup has really bad proration. The most you can do is followup with 6CC > 236C > 214A > Dash 5C > 2C > 236C > 214C > 22B/C. You can opt to do this technique rather than the air combo > j.236D > j.214A (delay hit) > Orb > Unblockable setup, but note that the crossup of course does not work when you're too close to the corner as the orb will go off screen.