Possible to hook iLogic trigger to Title Block variables?

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Greetings,
I am currently working on updating various (2017) .idw templates and one of the things I'm trying to add is a dynamic border that adapts to the sheet size.
That in itself isn't a problem - the script works as intended - but I would also like it to update whenever one of my students changes the current sheet size. But from digging through the available information and various forum posts, that does not seem to be directly possible. One would always need to either trigger the script manually or hook it to saving the document or some such, which seems less than ideal.
Then I realized there is a sheet size variable you can use in title blocks that automatically updates itself, so there is clearly already a variable built into the program that can be used.
So my question is this: Is there a way for me to use this title block variable to hook up an iLogic trigger? There already is an "iProperty Change" trigger, but that by itself doesn't seem to be enough.
Thanks in advance.