Change RHEL 7 RC Server Edition to RHEL 7 Workstation?

How can I change a RHEL7RC Server install into a RHEL7RC Workstation install?

I have tried disabling all the server repos--though "rhel-7-server-rpms" simply refuses to let me disable it.

I was successful in adding the workstation repo:

[root@virtue Desktop]# yum-config-manager --add-repo ftp://ftp.redhat.com/pub/redhat/rhel/rc/7/Workstation/x86_64/os/
Loaded plugins: langpacks, product-id
adding repo from: ftp://ftp.redhat.com/pub/redhat/rhel/rc/7/Workstation/x86_64/os/

[ftp.redhat.com_pub_redhat_rhel_rc_7_Workstation_x86_64_os_]
name=added from: ftp://ftp.redhat.com/pub/redhat/rhel/rc/7/Workstation/x86_64/os/
baseurl=ftp://ftp.redhat.com/pub/redhat/rhel/rc/7/Workstation/x86_64/os/
enabled=1

I would really rather change the install, instead of being forced to reinstall all over again.

Thanks in advance!