[ceph-users] Switch docker image?

This has got to be ceph/docker "101" but I can't find the answer in the docs and need help. The latest docker octopus images support using the ntpsec time daemon.  The default stable octopus image doesn't as yet. I want to add a mon to a cluster that needs to use ntpsec  (just go with it..), so I need the  ceph/daemon-base:octopus-latest docker image. Could someone offer the [cephadm ?  ceph orch ? ]  command sequence necessary to add the mon to an existing cluster using a specific docker image that's not the one used elsewhere? Thanks!