Here's a WeakAuras progress bar code for SW Death. It will first show the GCD progress after the first instant cast only. then it will show the progress cooldown after the 2nd instant cast.
The only problem I'm having with it is the countdown text. I can't figure out how to make it only show 0.0 text format instead of 0.0000000000 format.
If anyone knows how to change it to 0.0 format please let me know.