With that, I figured it out. . .
Create a series-of-items array. Using “context selection,” click on the specific scene instance for which you want to change any variables, and then reference the selected item and connect the item to index “0” in the array. Once done, do the same for any other items of that class in your scene for which you’d like to make specific changes. Any variables to be changed require the appropriate targeting. The code works itself out nicely from there.
I’ve included an example below. For my own purposes, I will add twenty items to this array, setting a different “Heads Selection” integer for each. Later, I’ll do skin color. It’s a weird project, I know. But someone may be able to use this for a variety of other applications.
Enjoy and thank you.