Automated replication management

I've been working with the official docker container and have succeeded in scripting a complete install and configuration of our LDAP instance(s). Now, I'd like to go further and automate the addition and removal of a multi-master instance. Has anyone already succeeded in doing this?

Currently, we have two EC2 instances in AWS that have a multi-master replication agreement. I'd like to be able to run a script that:
1. Brings up a new EC2/389ds container instance
2. Adds this to the existing multi-master replication agreements
3. When this is finished replicating, remove one of the current instances from the replication agreements

I can do part 1, but I'm concerned about making parts 2 and 3 bullet-proof.