Moving or upgrading the central refuge islands, including a zebra crossing, was considered but discounted on safety grounds. Pedestrians would still need to judge safe gaps in traffic. A zebra crossing in this environment relies on all drivers stopping for a pedestrian, which can be unsafe on a busy multi-lane road.
A full signalised intersection is not suitable, as it would encourage more traffic onto the side roads and slow Ulster Street traffic more than the preferred signalised pedestrian crossing. The preferred design would only impact drivers occasionally, when people want to cross. Full signalisation would likely result in stopping traffic on Ulster Street once every few minutes.