Script Request [VX] Call common event upon application/removal of states

I've tried using common and battle events, using conditional branches and also with Variables.
This is the skill I want to make function, but currently I can't figure it out. I'd imagine if a script could be created to call a common event upon the application, or removal of states, I could easily get it to work. Here's the skill:

Name: Divine Guardian
Description: An attack that would otherwise kill an ally|will instead restore them to 100% health/mp.

I would like for it to trigger when the character is killed and upon becoming incapacitated, it'll run a check, see that the character is incapacitated (through a conditional branch), then run the 2nd check (through a conditional branch) to see if the character if afflicted with the Divine Guardian state, and if they are, for it to activate and instantly revive the character. I already have the conditional branches all setup, I just need a way to be able to call the common event at the time the Incapacitate state is applied, which I believe with a script like this, I could do.