My first thought was swap some power pins and blow up their gear! It could be possible to make up an adapter to reverse them so the port was still usable too.Swap pins 14 and 6. Just don't forget and plug something of your own in by mistake
Aren't the Crafters effectively just Sprinters with a different badge?
Edit: Wiki to the rescue, seems they were but aren't as of the current Crafter model.
That’s right, old crafters were sprinters, new ones are vw.