Leap of faith, can I ask that you post pictures of your bag so that we can see how bad the dye transfer is? Replacing a panel is serious work, so unless it is a HUGE black mark, similar to a sharpie pen oozing all over it, I would not suggest doing that. Let's try a few things first before doing the complete transplant. Don't worry, we will figure something out. Also, are the dyes from your abaya natural dyes or chemical ones? That will make a difference as well. I'm no expert, but logic still has a place when it comes to leather goods.