I just managed it last night - I think I tried somewhere in the region of 20 times(felt like 40) I had:
Ezra G10 Hera/Chopper/Zeb/Kanan at G8 all uniques omega'd and with an absolute max of +25 speed on each one of them mod wise(in other words nothing special)
I just kept plugging away, follow the kill order, and eventually it's going to go your way. Now I'm an F2P veteran of CLS and R2, I strongly believe that this RNG lottery is great! And here's why. These characters shouldn't be a gimme, and the fact that you have to play so many times mean that you actually know how to play with toons you don't use normally!