LONDON, Feb 3 : JPMorgan is finalising plans for a new index to track frontier market local currency bonds, investors consulted on the details told Reuters, as the bank looks to satisfy a growing appetite for riskier and more diversified high-yield debt. The move, which comes 15 years after the Wall Street bank launched its hard-currency NEXGEM frontier index, coincides with the year-long slump in the dollar and some extraordinary recent rallies in markets like Argentina, Ecuador and Uganda.