Yes, I agree with Jon that custom label templates would be a good solution here.
As the items probably have the same container type, this won’t be possible just yet, but we’ve got Override the stock label template to use on a per-product & per-beer basis in the plan for implementation very soon, and this would allow you to link just the multipacks to a non-default template where you have removed the expiry date.
I’ve made a note to follow up with you here when the other feature is done so you can give it a try 