Chris,
I don't know if the same rules apply in New Zealand but in Australia you can hold a class 1 medical certificate with CVD and you can hold a CPL and fly commercially.
You may wish to check with the NZ authorities.
However, a note of caution, the current figures (and again I refer to Australia) are that there are 14,000 CPL holders not engaged in flying jobs so competition may be strong.
HTH
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