AutoCAD Inventor :: ILOGIC Workflow / Way To Add Rules

I made a simple rule that triggers before save to ask user to make a selection, which then updates an iProperty.I created A multi value fxParameter and used the InputListbox function.

Ultimately I want to know the best way ok making this rule available to all parts, old and new.I am thinking, it will be easy enough to update my templates and embed this code into the part, as well as content center files by updating each file / template .

But for existing parts, is there a way to add these rules without the user having to do much steps.because there is an fxParameter I am thinking the user will have to know how add this to their part.I can change it to just an input box where they can type in the correct value, if that would be easier.