You should be able to substitute a DB export from SB3 for the standard import during the install, and so just have the one step. The details for doing that will be in the system copy guide. I don't have the Windows system copy guide either, both because my systems aren't windows systems and because I don't use the official copy process! I'm sure if you keep searching it will turn up. If you search SCN for "homogeneous system copy" there are plenty of hits. One of them will contain a link to the guide...
Steve.