I'm honored to recommend a novel to you. The title of the novel is "I'm not cannon fodder in the apocalypse." Although the plot of the novel was not exactly the same as the description in the question, the novel did fit the description of the title,"Reborn in Germany during World War II, then fled to Switzerland." The protagonist of the novel was reborn in the end of the world, and there was also a plot in Switzerland during the escape. I hope you like my recommendation. Muah ~