Add function to only print default despatch note and not alternative docs

I have Mirakl integrated for my clients who sell on Asos, Debenhams and B&Q. Mirakl is generating a despatch note, and pushing through with the order, but this is not the despatch note I want to send with orders (we have custom built branded ones instead). The system won't allow me to not print the alternative note so we are having to print both to get the default/custom built note, and having to throw away the Mirakl despatch notes. We need the ability to choose between default and alterntive and not be forced to print both.