Waterwings, the air NZ strike situation was pilots employed by the same NZ company. VANZ employment is an NZ company with NZ aoc owned by Virgin. VAA is Aus employment on aus aoc.
This and the air NZ strike are two different situations, as is the jetstar one as they have Aus aoc and cross crew with NZ/oz guys. VANZ don't.
I believe alpa and the VANZ negotiators have already looked into this and know it would be illegal.