How would you suggesting restructuring the legal system so that currency becomes fully a central bank liability? And how would such a restructuring help to imp

How would you suggesting restructuring the legal system so that currency becomes fully a central bank liability? And how would such a restructuring help to improve the current model? And very importantly - what is the practical next step? You can't make all of the U.S. dollar a direct liability of the central bank overnight without collapsing the global financial and geopolitical structure?