Elastic Beanstalk Custom Platform without AMI Build

I already have a process to build a custom AMI and would like to utilize that AMI within a Custom Platform. Currently I am setting up an environment using a similar, AWS provided platform, then I update the AMI with a script after each new AMI build. As you can imagine there is drift between when I first created the environment and now because although I am updating the AMI nearly every month Elastic Beanstalk is unaware of this and is yelling at me to update.

Following the eb platform create process requires a base AMI and it will create a new AMI, this is an unnecessary step as the AMI I am providing is suitable without any modifications. Furthermore I am running SELinux on the AMI and this is creating issues when attempting to run "provisioners", even echo "do nothing" is not allowed.

I would like to see better documentation on aws elasticbeanstalk create-platform-version with an example platform-definition-bundle file. Does anyone have a file they use? I cannot find a single example anywhere.