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OK, I figured out a solution (let me know if there's a better one) to my question.
You can see my solution in the attached workbook.
Basically, I created another text table worksheet (text avg) and set the measure aggregation to "average" instead of "sum". I then swap this text worksheet into the visualization whenever the selected metric is "Sessions per User".
Thanks Peter for your quick response. I haven't read the article that you linked yet, but will do so and let you know if I find a better solution.