One doesn't need to get rid of the CO2. If its already there why take it away and add more sugar to make it again. Heres a more technical guide that allows for different max temps before bulk priming so that if you don't want to diacetyl rest you don't need to. http://oz.craftbrewer.org/Library/Metho ... uide.shtml
I have never had a problem with over carbonation using this guide. I have however had overcarbonation from lagering and using too much priming sugar (150gm of glucose) for a 12C brewed beer. It wasn't too bad (a little like champagne) and after 5 mins its down to acceptable levels and the head retention was fantastic to boot.

