Hi Arno!
Thanks for circling back on this topic. Correct! The User Management Tool is where the focus of managing users is being put. There was a recent round up call covering the User Management Tool you cited.
Further @kenn or @Fred are the primary authors of the tool and are available to answer any other questions.
Please note: the tool will require some additional configuration to work with your deployment. Further, it has yet to be used outside of the the Uganda, Kenya and Togo MoH deployments. We would love to assist you in getting it to work for your deployment though!