https://github.com/confluentinc/cp-ansible/pull/497/files
look at the PR where kafka_broker_inter_broker_listener_name is the default, the maintainers have discussed that port as unnatural.
I agree.
What does RBAC being enabled have to do with the kafka appender's port being inter broker listener?
I think it should be internal by default. (like ksql_bootstrap_servers)