If you decide you don't like your new job in your current country then you look for another and move on, but we were worried we might have visa problems if that happened in NZ.
This would be the case if he was on a work visa, since that would be tied to the job. In that case, if you want to move on, you have to get another job, fast, that is also skilled, or your visa becomes invalid. You may find that the employer wants your husband to go for a work visa in the first instance, to get him there and working faster (as these visas can be worked more quickly), but there's nothing to stop him applying for that alongside SMC Residence.