Kim --
Ask her to find you a nice little Blackstone of similar weight. Ask her to bring that home, & buy her another Enfield when she gets here.
Not worth enough to merit bringing it back, IMHO. Now down to less than =A32k brand new. =A31k for a decent s/h version. Shipping will be costly enough, & I'd check the residual value in NZ -- could well be higher than here. Well worth doing for rarities, but I'd suggest current production bikes don't tip the economic scales the right way.
I'm a great fan of importing goodies, & brought a couple of m/c back from the US when I returned. No difficulties at all, nor any duty as I'd owned them for a year in the land of the free (Florida
-- can still ride without helmets -- wonderful to be au naturel again after 35 years with head stuck in a bucket, especially in hot, humid climes).
Colin