@Moondeer Actually, I could probably accomplish this with some Javascript that looked for links to posts and replaced them with cards.
@manton Thanks, I just moved it over to plugin-cards. It should work as opt-in via additon of the ?cardify
query … I have it generating cards via hostname matching but the CSS selectors I use would likely need to be retrofitted for other themes (stuff like main .post-body a[hostname match]:not(.read-more)