Thanks for your feedback and the info about how the minified script gets.
I don’t really see how I can make the changes I want to make without editing the acf-pro-input.js file directly. I’m looking to make changes to the flexible_content object and that will require me editing the aforementioned JS file and class-acf-field-flexible-content.php. So I would have to create new files that would get loaded into the plugin instead of those two files. Basically I’d need to create a child theme for the plugin and I’m not sure how to do that! Any guidance as to where I’d start?