repying to my own question but i managed to figure out how to open Home Assistant either using the native browser or something like Firefox focus.
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Connect to your device using ADB - you can do this by connecting a cable to the MicroUSB port inside the NSPanel Pro
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Follow the steps on this page to connect it via WiFi (will make things easier in the long term).
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Optional - install FireFox focus using the APK found on this page using the following command:
adb -e install /path/to/your/downloaded APK
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To open your HA instance/dashboard, copy the following command into a terminal and replace the square brackets with your URL:
adb -e shell am start -a android.intent.action.VIEW -d [URL of your HA instance]
The NSPanel Pro will now ask how you want to open the link and it’ll let you log in.
Thanks @simonbooth for finding that it’s unlocked, that’s opened a world of possibilities now. Just need to find a way to run a script on startup
Edit to add:
After setting up as above, the panel seems to work with the Android TV integration. Follow the UI set up for Android TV, enter the IP of you NSPanel Pro and leave all the other settings as they are and you’ll find the device is now shown in HA as a media player.
You can then use the AndroidTV service to send scripted commands as per the discussion on this page