Yes its simple and very quick.
Each currency can either be a base currency in a pair or a counter currency - the first currency is the base currency, e.g. USD/XXX and the second currency is the counter currency, e.g. XXX/USD. Each of the 8 major currencies appears in 7 of the 28 pairs with the other 7 currencies. If price is above the 50EMA, that is bullish for the base currency, and bearish for the counter currency Go though all the 28 major pairs and award 1 point which is either bullish or bearish to each currency. The maximum, most bullish score is 7-0: the most bearish score is 0-7.
Right now the most bullish currency is NZD, 7-0, and the most bearish is CAD, which is 0-7.
For all 7 major NZD/XXX pairs price is above the 50EMA and for all XXX/NZD pairs, price is below the 50EMA = 7-0.
For all 7 major CAD pairs, CAD/XXX price is below the 50EMA, for all XXX/CAD pairs, price is above the 50EMA = 0-7.
The strongest trend-following pair is therefore: long NZD/CAD.