SDK Hooks for Reading Order tool?

I've been developing an Accessibility Plugin for Acrobat that automates some of the repetitive formatting tasks I need to do as part of our remediation process. It was relatively easy to map the commands into menu and context menu items but I'd like to make it even more intuitive. 

Since I'm also using the Reading Order tool for much of my work, I'd like to extend the tool to add buttons, dropdowns, and checkboxes for some of my tools. Does anyone know if there are hooks in the SDK to gain access to the Reading Order panel? The tool looks like it's been designed as a Plugin itself, so perhaps there might be open source code I could extend? I know, I know: not likely, but one can be hopeful 🙂