Many of the posts above are irrelevant, as the OP is in NZ. So, in NZ:
You can use any navaid you like, enroute. You don't need an alternate just because the destination only has a GPS approach. VOR approaches are available all over the country.
So, in NZ, I can see no reason to put NDB approaches on the IR, unless your next job requires it. (Which it usually doesn't.)
At least, that's the advice I used to give between about 2008 & 2011. I don't imagine NZ has gone backwards since!
Australia, different story altogether. Different advice required.