Hi there chas0unique!
That sounds pretty neat actually.
It sounds like you would need two things. First setting up the metadata for the category to accept an image – image URL. Then the theme would have to display it somehow. A quick search yielded:
https://php.quicoto.com/add-metadata-categories-wordpress/
Or even using a plugin: https://wordpress.org/plugins/wp-custom-taxonomy-meta/
Hope that helps!
This did not work. Any other way to have a different header/logo per category page?
This did not work.
What did not work? The plugin or the article? The plugin does provide some information about how it works and should be used: https://wordpress.org/plugins/wp-custom-taxonomy-meta/installation/
The article is a bit of an overview of how to do it and does go a bit more in-depth on the process of adding that information to the taxonomy. 🙂