I’m looking to change the default author page links (like those in when you click on an author’s name at the end or beginning of a post) to link to their buddypress profile. Does anyone know if that’s possible and how to achieve it?
You could probably do it by overloading your theme, just find the place where it’s adding the post_author link and overload that using a child theme.
The file in question is usually themes/yourtheme/single.php somewhere it will probably be calling get_author_posts_url($author_id) which points to the WP author page, you’d replace that with bp_core_get_user_domain( $author_id ).
That’s the general gist if what you need to do, but it might get complicated depending on your theme.