The legacy of Yul Brynner is taking a pounding as scriptwriters rewrite his part in the King and I in a last-ditch bid to appease Thai authorities. Thai advisers were yesterday in Los Angeles at 20th Century Fox urgently trying to make Chow Yun-fat's updated King Mongkut character less eccentric, flirtatious and comical, industry sources said. 'We need to come up with a more heroic and statesmanlike version for Chow than the king made famous by Brynner,' one adviser said. 'He will have a full head of hair for a start. And he will be serious, clever and stern.' The bald Brynner never wore a wig in the long-running Broadway smash or the 1956 cinema classic that catapulted him to stardom and won him an Oscar. Thailand banned the film and the musical and has so far scotched attempts to allow Fox to film the updated Anna and the King on Thai soil. Fox had begun pre-production work in Kuching, Malaysia, but would switch back to Bangkok if speedy approval can be granted by Thailand, said Sorajak Kasemsuvan, a spokesman for the Thai co-ordinators.