It has been done. I have carbonated beer in the keg and am currently enjoying it at my leisure. Never mind that it isn't all that good of a batch, I will drink the whole 5 gallons proudly. After discussing what we were going to brew Ernie and I went to the homebrew store and kind of made up a recipe with things that looked/smelled/tasted/sounded good to us at the time. This is not a great idea for homebrewers of my level of expertise but loike I said I will drink the whole 5 gallons proudly and enjoy every sip.
I'm the guy who writes this crap