MUMBAI, April 15 : India's foreign exchange restrictions have made it costlier and more complex for overseas investors to hedge against rupee swings, denting the appeal of Indian bonds, while a war-driven hit to earnings prospects is adding fresh pressure on equities. Steps taken by the Reserve Bank of India to steady the rupee — including curbs aimed at limiting arbitrage trades — have eased pressure on the currency, but at the cost of higher hedging expenses for foreign bond investors in both