I think you should ask the Codex Alimentarius (international organism regulating food standards) to change the definition of the term "milk", since that is where it is defined that milk is secretion of the mammary glands of dairy animals. I don't know if this request is so simple to do, although times change and societies advance, some things should be made more flexible.

On the other hand, in Argentina the term "milk" cannot be mentioned in a product that is not, these must receive descriptions of the style 'drinkable food based on vegetable X ". But "milk" in the packaging? Absolutely not.