TOKYO (Reuters) - The Bank of Japan is set to maintain its massive stimulus programme on Thursday and vow to take further action if the economic fallout from the coronavirus shock threatens a return to deflation.But the rising cost of prolonged easing and a dearth of policy tools may mean there is not much the BOJ can do beyond rolling over its crisis-response package, or count on the government to unveil another spending package to re-ignite growth, analysts say. Given the need to keep in place some restraints to economic activity to prevent the spread of the virus, the BOJ is not in a position now to push prices higher with further easing, said Naoya Oshikubo, senior economist at SuMi TRUST. “As a result, the key policy drivers under Prime Minister (Yoshihide) Suga will be fiscal policy, deregulation and growth strategies, leaving monetary policy on the sidelines,” he said. In a quarterly review of its projections, the BOJ is seen cutting this year’s growth and price forecasts as the pandemic hits domestic demand, sources told Reuters.