@nachof I found a way to make it work: https://gist.github.com/jessicah/cd580bab64d89875a157579789b03511 by overriding _show() in component:user-card-contents. I’m guessing the leading underscore means we probably shouldn’t override it? But it seems to work:
Perhaps there needs to be an entry point to optionally get the username from $target? Anyway, this was really a blocker from my POV to deploying to my wider community. Time to roll ahead 