The same information is available there as with the player casting bar. So it's possible to do as a target window or a custom UI piece using the same sort of code I made already.
It's somewhat problematic if your casting haste isn't constantly over the cap, though.
But if it were a custom window, you could put rescaled bars next to eachother to see if your casting and the mob's casting will match up during the last second. I don't know if that would make it easy to cancel, though... as it's only a second and human reaction times kinda suck.
I understand your dilemma though. I usually have immunity to stun/stifle, but it's nice to land a group cure just as a KB AE goes off and you cure while in mid-air. (before the game interrupts you)
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