I can use JSON (or even jQuery by grabbing content from the page) to put an extra option in the dropdown but it screws up as it's not a valid product. I need it so that the default option is the title (eg: "Pick a size...") and so that it can't be picked again. I need it to work in conjunction with that existing script.
That's the general mechanic. Just use a data attribute to store the placeholder and remove the option you added once the dropdown is changed to a different value. You may need to couple this with the linked-list bits by using custom events (didn't check the other script), but this is how you need to do this.
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