I thought if you used the "/migratedrivers none" switch on setup.exe, no drivers would be migrated, and I have even tried that... this is the command I have tried:
setup.exe" /auto upgrade /compat IgnoreWarning /dynamicupdate disable /showoobe none /migratedrivers none
setup.exe" /auto upgrade /compat IgnoreWarning /dynamicupdate disable /showoobe none /migratedrivers none