Thanks for your input, Robert. I don't think I want to dive into Arcade at this time, as I have my hands full with just trying to move over to Pro.
I should clarify that I am not set on the idea of using the pop up hyperlink to accomplish my goal....I was exploring that as a possibility, and I initially thought that it might be the quickest solution.
I have managed to make some progress by going another route, which is a Task coupled with a Python Script Tool.
I took the python code from my ArcMap project (which was stored as part of the display properties of my feature class layer)....and did A LOT of editing and made it into a script tool. I had to update the code for Python 3, update methods used (because what works in the python window doesn't always work in a script tool), and I also need to account for the absence of pythonaddins in Pro (still have some work to do on this part) for some error handling.
The script requires a selection in order to run correctly, so I had to create a task to facilitate the user making the selection, and then the script tool runs as part of the task, after the selection is made. It is still a work in progress, but I think I'm getting close to a satisfactory solution.
I am really peeved that I have to spend so much time re-engineering a solution that I developed many years ago....especially since the final product is most likely going to be a little less elegant solution compared to what I had in ArcMap.
If I get this up and going, I will post more details and code.
Thanks!