I'm trying to do this, and I'm writing this because I can't find the commands or tools to implement it. I see that there are SpineEvents, but I can't see how to operate on the id on the previous value.
Viewing post in Spine Extension for Clickteam Fusion 2.5 comments
You can get the value when the event occurs.
I hope this will be of some help.
http://ugken.com/ext/Spine/EventCheck.zip