For starter, you can delay the 623 like said above, or you can replace 2C with 5C in most cases, IE 2A 5B 5C 3C BE623A etc
Yeah but that is only off 2A starter, off air counter hit or raw 623[C] you still need to know how to do the delay version.
Another good idea since you will still mess up sometimes, I know I do, is learning that off the 623[A], you can get a sick 2-way crossup that people don't probably know exists.
just 623[A], walk forward, 29
*496 crossup
*backdash uncrossup
I'm going to try to figure out how to use that hitbox viewing stuff this weekend and get images of j.A,j.B,j.C and the 421 series, and 214B/C.