The process is really simple. I actually took the idea on how to do this from Ezequiel so you will need to see his post for detailed information.
Basically you do the same than when installing WCSF, but do it with the EntLib May MSI and in the RegLocator change the entries that reference 8.0 for 9.0 and that's it. Save and install and have fun.
I will edit this post with issues and workarounds as I find them.