While I think NC is a terrible license, hasn't it been settled in court that you can hire someone to produce CC-BY-NC material? You can't run a business selling the material, but you can be hired to produce it.
I'm not a lawyer, so it's not that hard to imagine that I'm missing nuance, but... what's the difference?
Just because there was a court ruling in one country, doesn't necessarily mean it is legal in another country.