@Cartunes surely it's just a case of swapping the ign and +ve on the alpine loom if the ISO plugs fit no? Used to do this all the time...
No mate - as I said before (ten thousand plus head unit fits to my name and I've designed many of the ISO cables for various manufacturers) - there are two extra connections in the VW OEM unit that may damage the aftermarket head unit - it's nothing to do with the "red/yellow" swap as you quite rightly have to do on some cars. The aftermarket unit might not have anything connected internally to these terminals, but those that do can BURN baby BURN!
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