Download the Journal Viewer and put the actual setup.exe file in your updates folder and then put this in your svcpack.inf "setup.exe /q /c:""msiexec /I """"Microsoft Windows Journal Viewer.msi"""" /qn"""
The sfc_os.dll in SP2 is not the same as the one in SP1. Right now I am comparing both the dll files to see the difference between them. Hopefully this should give us some clues to try and hack the sfc_os from SP2.