Custom Event Handlers?

[Shillelagh]

For a persistent mission I would like to save some data types but I don't want to make it so I can just call one function globally that will run on each object script to save it instead of in the save function.
I've tried using "addPublicVariableEventHandler" but that doesn't seem to work.
(https://community.bistudio.com/wiki/addPublicVariableEventHandler)
The intent is in my "saveGame.sqf" function I can call one event.
And have an event handler on each object that will run when "saveGame.sqf" is run.
Any ideas?