This is tough. Don’t forget many of the NZ players have been isolating away from home for quite some time. Apparently the player’s association was asked and the players aren’t up for it - would imagine in reality some will be and some won’t, but they won’t want to come with weakened sides.
There is some BS in the excuses they are making IMO - bottom line is the players are sick of quarantine and all, they’ll do it for their employers because they have to but maybe not for an international tournament on top of that.
Ironically the UK will probably be safer than Australia by the time the tournament takes place.