You might want to look at the reliability guarantee if any that One NZ will give the satellite text message feature.
Most likely in their T&C there will be verbiage that says not to use it as a replacement for dedicated services.
That is why I said PLB plus txt. The satellite txt function of inReach is a fantastic function, but there is a 20min round trip. If Starlink and One Network can get that down that would be great.
I am just jaded about all these new services touting how great it is and have been burnt in the past.
Was just trying to warn you to look at the T&C for the service and thoroughly test it before dropping your other service.