In so far as LAV type vehicles exist without turret mounted auto cannon (ie. The Canadian Bison) I'll agree to disagree with you at this point
An interesting question (to me anyways) is:
Could New Zealand have purchased a useful mix of new or used Bison type armoured vehicles and surplus Canadian fighter aircraft for the same price as the LAV purchase ?
Would the savings from having a smaller fleet of less sophisticated armoured vehicles (that don't need 25mm practice ammo) have funded a basic air defence capability ?
Edit to add:
Maybe in the 1990's New Zealand does an arms deal with Canada and gets surplus F5's and new or used Bison APC's ? (In this time line New Zealand would presumably get the upgraded F5's that were sold to Botswana IOTL.)
I realize the surplus Canadian F5's would be less than ideal but they would be better than nothing
Also I seem to recall the Australiains hired some former Canadian fighter pilots as Canada downsized their fighter force. Potentially New Zealand could have done the same thing. This would have cut down on training costs.