I'm afraid you might have to log a case with Symantec Support, I don't believe there is anything more uptodate than the article you linked at this time.
TBH, you should still be able to amend/delete the regkeys highlighted in the article. As far as I can tell, the only bit that won't work is the removal of the files/folders which require the use of the IceSword util.
Perhaps you could try using the SysInternal tools instead, and set the files/folders for deletion on reboot when they are no longer used:
http://technet.microsoft.com/en-gb/sysinternals/bb897556
If you have a test machine handy then this might be worth a go, otherwise it's Symantec Support case time!