Probably not what you want to hear, but I think exiftool + bash script really is the way to go. A few years ago I had a similar need and searched for hours online… I ended up hacking together a “good enough” bash script that reads all the dates of my pictures and does some stuff. It took 30 mins of reading some basic bash scripting basics. Way less time than searching for a tool that probably doesnt exist.
In 2024, you can probably just ask chatgpt to write a quick and dirty bash script for you and it might require another 10mins of debugging/begging chatgpt to fix its mistakes
Free = libre, not gratis