Disc ejected trigger?

I'm finishing up my 0-click copy disc macro and want to know when it's done to notify me in some way.

The closest thing to that in KM I can find is make a trigger that fires when a volume is unmounted:
Screen Shot 2022-03-27 at 2.53.42 PM

The problem I'm having is that writing a disc and ejecting it doesn't seem to be the same thing as unmounting a volume - at least that's not how KM treats it because the trigger doesn't fire.

The only other option I have to monitor this is to write a 'Pause Until Found Image' action – but that eats some significant resources that I don't want to use when burning a disc. I just don't want to risk adding any skipping or corruption while writing

Are there any other ways to trigger on a drive that was just opened? I'm not sure this is a bug since the disc isn't exactly mounted in a normal way.