Altus Director does have some limited ability to use an existing CM server (see the notes in https://github.com/cloudera/director-scripts/blob/master/configs/aws.reference.conf#L487-L490). There are gaps in what CM related features will work, especially around TLS/SSL and external databases. Do you happen to have a backup of the old Director's database? If so, you could use that to restore the state on a new Director server. For either of the above paths, I would recommend opening a support case with Cloudera if you need to pursue this for a production cluster.
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