My view is that they should do it twice and make use of the zip line. This would make it twice as much climbing and also have an interesting situation where the riders sprint to be the first ones onto the zip wire, adding to the drama and introducing an interesting novelty element to the race and perhaps get new fans (what having a race in new parts of the world is ALL about). Not only that, but with all the dangers of descending doing it by zip wire could keep the excitement factor but also eliminate the dangers. It would also create forced time gaps which would make the race more exciting. Do you go super hard first time up to gain an advantage by being first on the zip line, only to crack the second time around? Also the organizers would love it as it would bring loads of attention to their tourist attraction