Amazing trip Guy, should be fantastic.
As others have said the Audi block heater should be the best thing for pre-warming the engine. Do a search on block heater vs oil pan heater, I think the consensus it that block heater, especially recirculating one, is more important (for protecting the engine) than oil pan heater.
There are some discussions about it on Bobistheoilguy, those guys from Northern America have to deal with some low temperatures.
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