Convert a RHEL Desktop installation into a Workstation install

What steps are necessary to convert from a Desktop entitlement to a Workstation one? I have entitlements for both, but I have several systems that will need the migration soon, and a reinstall would be less than ideal.

These systems are being upgraded primarily for the max RAM capacity.

On my test network I tried doing this on my computer that was originally configured for Desktop, and migrating to Workstation via subscrtiption manager didn't quite work out, I could get access to the Java channel, but thats it.

Thanks,
Andrew.