Could I use ginger beer instead of hard cider? I'm not a hard cider fan.

If you read the comments below the recipe, at least one person added ginger beer and loved it. They didn't substitute, but still, the flavors sound like they meld. Another comment was about dividing all ingredients by ten to make a test cocktail. Last but not least, sometimes when an ingredient is part of a recipe, it becomes part of the sum and you may find you like it.