Already done, see here as it should already be installable via the marketplace under V5.
I would consider the work done for TVoverlay, but I would love help adding support for the other apps as they only support text only and not pictures and video. I also have done some of the work that would allow you to scrape the push messages sent TO the binding from the phone apps, this would allow the binding to get notification alerts from other apps on your phone that could trigger rules. I created a proxy MITM for the Notifications for Android TV that should allow this and it allows you to capture the packets to do further development. I have not done any work on it recently except to make it V5 as I use the tv overlay all the time myself in V5. To get this binding merged I would need to either finish the work on the other apps, or throw away all the work and leave it as tvoverlay only. Are you interested in helping finish those areas?