Perhaps the fact that the hfslip entries get busted once you try to uninstall any component using the add/remove components window and that it doesn't happen when the file is defraged is good enough reason.
As you already did add a dependency on wget for the updates of hfslipfc itself, would it be possible to extend the functionality to automatically download all the missing updates?
I get a few file copy errors in txt mode for for example these files: bitstransfer.format.ps1xml certificate.format.ps1xml and some other .ps1xml and some other files although the corresponding packed files and entries in .inf are there, I guess the txt mode doesn't like the long extensions.
Your site lists KB971276 as English only and the file-checker also displays the ENU filename when it's missing, but there are localized versions of this fix, recheck the download page.
^^ That was with RC, which still contained loads of debugging code that was holding it back . Even though I expected it, I was really surprised how much faster the RTM version is compared to RC, it really flies.