You can add several LDAP directories for JIRA, but it's not going to do the failover you describe. You should be doing that with LDAP directory resolution, it's not JIRA's job to do your disaster recovery for you.
Each server you add to JIRA will present a different list of users to the system, even if the user IDs are the same, each one is a separate list.
I have multiple projects that use variations of the same base workflow. The variations depend on the requirements of the project or issue type. The variations mostly come in the form of new statuses ...
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