If you really need systemd, then I think you need to run in privileged mode. But I really think you need to rethink what you are doing. Running a bunch of services inside a single container is very un-docker like. The normal docker model would be to run each one in its own container, skip ssh completely (ssh into the host and docker exec into the container if you need access), and use a docker-compose file to link them all together.
If you really need them all in one container, I would suggest LXC or a virsh VM instead.