Swiss private bankers are turning to video games and virtual reality to attract a new generation of skeptical clients and see off digital rivals. Technology is likely to appeal to multi-tasking millionaires with little time to spare. In a fifth floor office just off Zurich’s main shopping street, researchers at UBS (UBSG.VX) are testing dozens of technologies to see what could make the world’s biggest wealth manager more appealing as fortunes pass to the next generation.