© Reuters. Women stand in front of board showing market indices in Tokyo By Wayne Cole SYDNEY (Reuters) - Asian shares attempted a rebound on Wednesday on hopes that Beijing could stem the rout in its markets without damage to the economy, though caution was the watchword ahead of a policy decision from the U.S. Federal Reserve. Australia's main index (AXJO) rose 0.9 percent in early trade, while Japan's Nikkei (N225) flitted in and out of positive territory. MSCI's broadest index of Asia-Pacific shares outside Japan (MIAPJ0000PUS) firmed 0.5 percent. Sentiment was soothed a little when Chinese regulators said they were prepared to buy shares to stabilize stocks and the central bank hinted at further easing. Yet investors were understandably wary of a market that, without warning, fell over 8 percent on Monday. The CSI300 index (a> More