So I have been toying with the proofing tools and input method editors (IME) from Office 2007. The issue with the single language packs is that you cannot just group the entire stuff together.
Also trying to run the MSIs from the individual directories for the proofing tools or the IMEs greets you with an ‘Error 1713’. On the other hand, if you run the MSI from the command prompt and passing along LAUNCHEDBYSETUPEXE=1 as an argument it will install. Curious.