I believe I have the duplicate version working, though its more of a quick fix that a solution:
? duplicated the shipping-awd.php and renamed the duplicate shipping-awd-2.php
? opened the file and did a find a replace ALL ‘awd_shipping’ => ‘awd_shipping_2’ to make them unique.
? updated the tile on lines 3,35,37 – ‘AWD Weight/Country’ => ‘AWD Weight/Country (awd_shipping_2)’ this is just to help differentiate between them.
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I’ve repeated this 6 times for different postage classes (1st class, 2nd class, next day etc…), each time just updating the pending number to keep each version unique, seems to work so far in my tests.