Not been there in a while, but surely there is a turning circle at both ends? And, they started to make a 180 from the centreline and not from the edge of the runway. It seems a 45m runway, so manoeuvring to the edge and then turning should be no problem. It used to be the case that on these type of runways in hot climates, it was mandatory to use the end turning circles.
The runway is short enough; I can't imagine making the 2nd turnoff was critically necessary otherwise the estimated stopping distance becomes crazy short.
As for 'backing up'; it is possible. Nearly had to do it once in Africa, B757, but fortunately we managed to negotiate another solution. Not recommended if you haven't been trained and with a wing walker.