I would give that a shot.During the repair install the new mother board drivers, then once you get into the OS just run the windows update and it will grab any service pack/ updates you are missing.
But I still think that you might be wasting your time with the repair, with the time you spend trying to get the repair working and new drivers, you could have just done a fresh install, install WSUS and then you could just name the machine the same as before and you would not have to modify any GPOs for the WSUS settings.