I’m documenting this for myself in the future, and also in case it helps someone else needing to do the same. I will link to not only where I found the script in an Apple Community forum post, but also where I discussed my tweaking and success in the ExifTool forum as well.

First, here is where in an Apple Community forum post, user-member VikingOSX posted their script that I then modified:

Script to rename pictures with date and time

And then here is where I posted my tweaked script along with some explanations on it:

SOLVED: How to modify Mac Automator Script to rename MOV with EXIF date/time?