Use the 'crab' technique up to and during the flare. Yaw the aircraft to align it with the runway just prior to touchdown and maintain wings level throughout.
Into wind 'Wing down' at the flare in a swept wing aircraft is usually due to incorrect anticipation of swept wing roll with yaw rather than a deliberate action! Most problems stem from flying at excessive speed in a cross-wind and then trying to control the resulting excessively prolonged flare.
However, the 'wing down' method of landing on one wheel does work for some - I just have grave doubts about suddenly changing from one method to the other during the flare, if indeed that is what you actually meant!