So world sailing have tidied up the sail bit quite well, wouldn't have been too hard for YNZ to have just copied that, it makes a lot more sense, if you actually want a rule.
Cat 3 "either a storm trysail as defined in OSR 4.26.2 d), or mainsail reefing to reduce
the luff by at least 40%"
YNZ say you are meant to follow the OSR rules anyway, just to add to the confusion. I hope they didn't pay anyone for that 3 years of revision that wasn't.
The NZ regs pretty much leave it up to you if you read it certain ways, why they felt the need to write another 2 pages after that I'm no