J.T.:
In the Land of Oz they are already way ahead of the rest of the world. Great example is at Cairns. For the airplane that is RNP capable, they extend the missed approach track to become the OEI track. In the example the missed approach ends at KABUT all engines operating. But, with an engine failure the track extends much further to UPOLO.
I don't know whether they use it for takeoff or just for OEI on the RNP AR missed approach.