Proc 4.1, step 2 from https://docs.redhat.com/en/documentation/red_hat_openstack_services_on_openshift/18.0/html/maintaining_the_red_hat_openstack_services_on_openshift_deployment/assembly_rebooting-data-plane-nodes could also set:

spec:
  servicesOverride:
    - nova

The deployment is just meant to add a new configuration file for nova, so this should be safe and would avoid re-running the whole deployment.