You might try the opposite: Embed the PowerPoint slides in Tableau and use Tableau's presentation mode. The simplest is to add the PPT slides as images in Tableau dashboards, but Tableau dashboards in V8 offer some of the same formatting options as PPT.
One advantage of this approach is that you can distribute your presentation with working data using the free Tableau Reader.
Thanks Jim for the suggestion, The idea did cross my mind, but unfortunately my present requirements are to embed the dashboard within PowerPoint and not the other way round.
Thanks for the suggestion nonetheless!