I’m a sailor and open source enthusiast and use OpenPlotter for my yacht navigation in preference to other proprietary and highly priced options. I currently simply install it locally on a Pi3 B+ but really like your system of supervised guest containers and would like to run it like that instead.
This appears to be supported however I’m unsure whether I’d end up with a Rasbian image or not.
I’ve posted on their forum where a moderator mentioned he’d done it with some issues.
Any assistance greatly appreciated