>Assuming the computer has already been added to the Domain by one of our techs.
This is easy. Configure your WAP2-Enterprise RADIUS server to allow both users and computers to attach to the WiFi network. Configure the group policy to perform both computer+user authentication.
When the user starts up the machine it will automatically attach to your network using the computer account. The user can now login on normally. Once they complete logging in the machine re-authenticates as the user.