What can the ECB do if it is too dangerous to raise interest rates?

The ECB may legitimately believe that it would be dangerous to raise interest rates when they have been very low for a long time, given: The risk of a loss of fiscal solvency for several euro-zone countries (France and Italy in particular) ;   The massive capital losses for bondholders. What can the ECB do to avoid raising interest rates? It would be impossible to change monetary policy objective, as a nominal growth target would certainly lead to higher interest rates at present; There remains the possibility of making the inflation target symmetric (a n inflation target slightly higher or slightly lower than 2% instead of slightly lower than 2%), which would enable the ECB to not react if an upturn in unit labour costs eventually pushed euro - zone inflation to slightly above 2%.