Not sure what "fixing" the beach implies. Beaches typically form where fresh water and ocean meet.
Getting another party to conduct a study will still involve engineering (ecologists and scientists may be tapped for specific information). The problem is who pays for that work - someone like Greenpeace? In the case of the USA, the money wins. I'm sure we will see the same in Jamaica whether it is for a small jetty and beach protection barriers or something really bad. Sandals has done the homework and from what I'm seeing so far, done it well. Now they have to sell it to NEPA and their neighbors.