How would this be better than individually previewing the Layouts on the CMS? If the goal is to “see what is happening on the Player”, then I don’t think this helps at all? And if you already trust that the Player will show things in the same manner as the Layout Preview, then you already have the tools available to preview each Layout in turn.
Is it just a case of adding a Layout Preview button to the Agenda View in the Schedule? That way you could simply go down the list of Layouts and preview each one.