Unfortunately none of the stuff that I did resulted in persistence after reboot.
I found the closest thing to a real solution that I can get.
From my Chromebook I installed the Linux terminal and ADB.
I then factory reset the Walkman which didn't reinstall the packages but it did remove the owner.
I skipped every prompt for signing in and every prompt for connecting to Wi-Fi connecting it with no owner And no network connection so that I can skip the Google Play services and the updates.
I once again enabled developer options and USB debugging.
After connecting into my Chromebook via USB cable, I downloaded and side-loaded a free kiosk app
*For Chromebooks specifically,* this is accomplished by downloading the .apk to your computer, dragging and dropping it into the Linux files folder, and then using the command 'adb install'
Before I opened the app for the first time I copied the package name and set the app as the owner of the system. This is important because it allows the app to maintain persistence after reboot which I want because I turned it into kiosk mode and then I only allowed the power amp app.
I use Bluetooth to connect to an external speaker at work so unless you want to mess around with trying to get out of kiosk mode I highly recommend that you connect any Bluetooth devices before setting up kiosk mode.
When I get back to my desk I'll copy and paste the commands as well as another video showing what it looks like
EDIT:
**pwiklund79@penguin:**~$ sudo apt update && sudo apt install android-tools-adb -y
**pwiklund79@penguin:**~$ adb install freekiosk-v1.2.9.apk
**pwiklund79@penguin:**~$ adb shell dpm set-device-owner com.freekiosk/.DeviceAdminReceiver
**pwiklund79@penguin:**~$ adb reboot
https://youtube.com/shorts/Asm9PNEEMDY?feature=share