To solve this issue I developed a webtool that will allow you (and I) to automatically export the setting for the carrier I need and re-inject them into your phone using APN Backup and Restore, the app is developed by riteshsahu, all credit goes to him.
First, a word of caution, APN Backup and Restore works without any issue with GB or HC but need to be installed as SYSTEM APP on ICS.
The tool is available here: http://www.osimood.com/2012/05/news-apn-database/ just choose your country and operator to see the details and if you want the XML to be imported with APN Backup and Restore just use the "Generate XML" button
The file downloaded has to be place in the folder /sdcard/ApnBackupRestore to be used.
I hope it helps, feel free to leave your comments and ideas!