stvwlf,
Check out this blog.
https://www.vinography.com
This is how I’d like mine to work. Seems like the direction you are going combines categories as well as pages? I assumed there would be a simple solution to this as organizing a blog into mini-blogs on each page, then being able to sort the entire site by categories appears to make tons of sense.
ie: On my blog, I may post something under the “education” page. I may post something else under the “events” page. Though each post is in it’s most sensible place because of it’s content, someone who is interested in anything San Diego, could choose my “San Diego” category and it would grab both posts.