Thanks, Tom. It seems to work, so I’ll find out. 😉 I found this article to help with keeping the customized output where I wanted it to be: https://pippinsplugins.com/playing-nice-with-the-content-filter/
So you would use the archive-{custom}.php and single-{custom}.php for this sort of thing? I’m guessing filtering the_content could produce unexpected results?