Quantity Selector: predefined quantity of 6, 12, 18 etc.

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Hi Community,

I am supporting a wine merchant who sells cases with 6 bottles each. They do not sell single bottles. So the customer can buy only 6, 12, 18... bottles

As the financial system processes bottles it is key  that the order contains the number of bottles (not cases). 

From my point of view the items must be set up as bottles BUT on the product page there must be a quantity selector as pulldown with 6, 12, 18...

I have checked Shopify methods (eg. variants - did not work) or apps (didn't find any)

Can this be implemented only by customisation? 

Any thoughts, tipps or experiences?

Thank you very much for your support