Perhaps a cooking system such as one of these might fit the bill;

http://www.youtube.com/watch?v=1NDJtchU0Ck&feature=grec_index

i.e.

Trangia 27-7 UL / HA or Esbit Alcohol Stove

together with a Go Systems GS2000 gas burner adapter or Trangia Gas Burner.

http://www.go-system.co.uk/catalog/product/view/id/296/category/43/

A Gasmate Adapter will allow the use of the cheaper Butane cannisters with bayonet connections.

Cooking in the sub freezing conditions using these cheaper Butane Cartridges wouldn't be a problem if you invert the canister and burn the butane as a liquid rather than a gas. i.e Butane has a melting point of -138.4 °C

Now if only Trangia had an aftermarket compatible 1 litre pot with an inbuilt heat exchanger such as the Primus Eta Power pots for maximum fuel efficiency such as the Esbit Alcohol System.