The anaconda kickstart for RHEL 8.2 and above includes a "rhsm" kickstart directive which one can use to register a provisioned host to a foreman instance.
The following tasks need to be accomplished for this

• Ensure this runs for RHEL 8.2 and above.
• Add a %pre section for embedding the katello-ca-certificate and add it to
  /etc/pki/ca-trust/source/anchors/katello-ca-cert.pem or /etc/rhsm/ca/katello-ca-cert.pem (we may need to add it in both places and run update)
• Add the new rhsm command to replace subscription-manager register template
• Add potential post script to update subman settings for package profile transaction (check the custom settings from https://github.com/theforeman/puppet-certs/blob/master/templates/rhsm-katello-reconfigure.erb)
• Add potential post script to make katello-ca cert to the consumers cert store
• Verify that < 8.2 are still on the old subman register mechanism.