Making the "n posts in topic" user filter appear in mobile

I’m trying to hack it so that the “n posts in topic” user filter in the user card becomes available on mobile.
What would be the easiest way to do this?

The two options that came to mind were to make the button appear somewhere on the post itself (perhaps between the title and the date), or in the share modal that comes up when you click on a date.

Any advice on which of these would be easier to implement through existing widgets and plugin outlets? Is there some other option that would be even simpler to code?

Is this doable with a theme component or would I need to make an entire plugin?