So I got some info from someone who knows a bit more, to lay to rest the onboards discussion, the streaming part would not be an issue, would just cost some extra money but the plane can't indeed cover the whole stage. The screen we saw with the onboards is something put together from a few cars that are on the stage and in range of the plane, the content would constantly change depending on who's there.

So yeah i suppose it's not gonna happen unless they make RallyTV PRO version which costs 240e and they get a second plane up there