Dehavillandriver. Interesting point you made. Cairns rwy 15 engine failure and curve through 120 degrees is a case in point. One hopes that if the company directive requires you delay the 3rd segment until reaching the final heading out to sea, that the runway analysis designer allowed for a variable higher 3rd segment than the standard 800 ft used by the company.
It would nice if the regulatory authority could require airlines to publish to what surveyed distance from the departure runway each runway analysis is valid to. At least the pilot would then know if he was on his own after passing that limit.