Unfortunately, I think you'll still need to pay the gratuities for your husband towards the drink package. If I remember correctly, you can't choose it for one but not the other unless something has changed.
NCL has some weird policies. For example, my son, as a third passenger, is not eligible for a package as a minor. However, if he were the second passenger, then he would receive the soda package since he is a minor. Yet, if my wife was named as the third passenger, she'd be eligible for the "free" drink package as would any remaining guests in the cabin provided they were adults.