Been doing some experimenting with C-Miyako. Against H-Moon characters, you can avoid a shield counter (and maybe hit them back) in the air by cancelling your move into a j.22A or j.22B. In rare cases, you can guarantee a counterhit with j.22C but most characters will hit you out of it.
So far I know it works on Kouma.
So how do we do this on reaction? Input your normals as j.2A / j.2B / j.2C. When you see/hear the clash, just input 2A/B/C to do the cancel. If your move hits instead, do you BnB as you normally would.
Why can't I just buffer 22 after I hit the button for my move? Because the input buffer is so huge that you will go into a ground stomp after landing if you try to hit any buttons afterwards. So even if your air move hit, you won't be able to combo.
Also, a corner combo that was shown to me in a video:
(2A 2A) 5B 2B 2C (delay) 5C 214[B] 5B 5C 2B xx air combo
It deals a whopping 100 more damage than the easier versions woooooooooooooooooo
Similarly, in the corner Miyako can get 5k damage in the corner off her 214C using -
214C (large delay) 5C 214[B] 5B 2B xx air combo
The trick is to wait long enough with the 5C so that your 214B will not cross up.