You are aware a 'shoreline' is where land and water meet right? Before they lose any the Dead Sea will be a rift that is wider than the African Rift is at the moment.
55C could evaporate a lot of water in a day and underground condensers would turn it into distilled water.
Perhaps ship them them some Hudson Bay Ice eh?
Good. The hundreds of rich Saudi royal family members that can afford to live in underground complexes will have lots of running water. The tens of millions of poor ones will have left for refugee camps in Germany long before that.