Is there any chance you'd be willing to do a step by step explanation of what you did to get this working? I've been scouring the forums, docs, and trying to figure out template categories and template pages to achieve exactly what you were asking four months ago and have yet to find a comprehensive explanation of how it works.
I'm definitely willing to "slog" through the multiple posts that address this question in a peripheral way as I know I'll learn a lot by wrestling with this. But I'd love to see a . . .
Step 1. Create a category template
Step 2. Modify it "this way"
Step 3. Go to . . .
That would be amazing. If you can't do it, then I'll definitely try to create a doc like this myself once I've figured it out. It seems like there are at least a few people who want this functionality.
Thanks, everyone, for the kindness you show and the hard work you perform on behalf of total strangers. It's amazing to come to a community of people who don't know one another but are willing to give freely of their time.