This is probably the sell NZD case with the highest potential. A buy from the 1.68 level could be rewarded with around 1000 pips if the case is correct.
Still the main risk is coming from news releases from UK and EU regarding the Brexit process. Also the future of Carney with BoE if negative, could have negative impact on the suggestioned case.
Shorting the NZD against other currencies will involve less risk. Still, the potential reward from this case might be worth it..