FYI:
We have posted our code and methodology for configuring and managing kiosk implementations using python, configuration property list, launch agent and Google Chrome with command-line switches (Chromimum command-line switches).
Here is a link to our GitHub repository, where you can review and download the code:
https://github.com/univ-of-utah-marriott-library-apple/chrome-kiosk
And a more detailed blog post about our kiosk history & background and implementation.
https://apple.lib.utah.edu/managing-mac-kiosks/
Let us know if you have any questions or problems.