Here is my new method. Build a huge vacuum chamber. A robot will be needed to rack the beer since I will not be able to breath in there due to the lack of O2. Now considering the robot does not drink half the beer and be passed out on the vacuum chamber floor, circuits burned out, the transfer can be made without O2 present.
Fluid dynamics to rack your beer? t It's homebrew gang. Don't splash it then purge the keg with CO2.