'Starting role from "tasks/alternate.yml" instead of "tasks/main.yml"

I have a large playbook that uses multiple roles to setup new servers. I'd like to re-use the playbook but for the decommission stage instead of calling into role_name/tasks/main.yml and having a lot of when: statements, I'd like to tell Ansible to call the role but start in role_name/tasks/decommission.yml.

As a first test I setup my main.yml file like this:

 - name: "Provisioning new server"
   block:
     - name: "Include the provisioning steps."
       include_tasks: provision.yml
   when:
     - not decom

 - name: "DECOM - Unregister from Satellite server"
   block:
     - name: "DECOM - Include the deprovision steps."
       include_tasks: decommission.yml
   when:
     - decom

But that's getting really ugly to maintain. Is this possible or am I overlooking an alternative way to setup the playbook?

ansibleansible-role


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