I'd be surprised if you could combine it with an Instrument Rating (not generally called 'Command' in NZ, your MEIR or SEIR is just tagged single pilot or multi crew) seeing as though you generally don't do reversal turns and other manoeuvres below MSA in mountainous terrain during IR training.
I'd recommend going somewhere down south, such as the Wakatipu Aero Club. Little more expensive than some other schools, but the training and more so training environment is unreal and you'll learn quite a lot. Would also vouch for the Canterbury Aero Club- prices a little better than Queenstown but still some pretty magical scenery.