In recent PeopleSoft Image updates, a new tool for implementing security changes was introduced. The Security Deployment tool simplifies the application of new security changes to your environment. But, the Security Deployment tool can be used to automate the application of custom security to your environments.
In the video below, I cover how to use the Security Deployment for migrating custom security changes.
Thanks for doing the job the vendor could not be bothered to and documenting this. Hopefully a link to here will end up in PeopleBooks one day!