This simple template aims to allow to create s3 bucket replication very simply across 2 Regions with the least parameters unrelated to S3 settings.
You will need to have created the CFN Macro cfnmacro-kmskey which you can install in about 2 minutes from here
Once I will have updated Ozone to make use of the Organization class properly, and a few more AWS macros, it will also allow to use the template for CloudTrail with specific KMS policies and Bucket policy for the source region.