Ugh. It's really hard. Mining is the first thing that comes to mind, but it's not fast and requires often significant learning to do effectively. 

I don't know enough specifics about the BS the NZ is putting their citizens through, but... You can buy KYC BTC and then make it disappear. If might not be "legal" but, as far as I'm concerned, those laws are repugnant and should be ignored.