From another thread, I was trying to learn the J2A > 5B combo and I stumbled onto a J2A > 2B combo. The timing is rather strict though, you have to hit 2B right as you land or else you'll just do a J2B. And if the opponent is cursed, doing J2A > 2B sets you up for a 6C loop pretty well with the auto B bug that happens from the 2B...so J2A > 2B > Bbug > 6C loop.
I've also noticed that you can go from J2B > 2A or J2A > 2C...im not sure if you can do J2C > 2A or J2C > 2B...but from the pattern with the other J2's it seems that you might be able to.