Well, I have a favorite resource but not sure it will help much…the book we used in the third and fourth years of my Italian classes was a really interesting exploration of each region. 20 regions, 20 chapters, 20 months of classes. “Here and There Through Italy” Another book I enjoyed that talks about stereotypes and differences was The Italians, by John Hooper, but it wasn’t specifically about regional differences.
I did a web search, as I suspect you did, and only found very superficial click-bait articles. Good question, though. I think I’ll dig a little deeper and see if I can find anything.