Hi Bart,
Good news!!!
For your PI question, see my previous response.
Now for full disk's, welcome to linux not booting
To be honest, no matter how large a file system, you will fill it up sooner or later
And for SD card issues, I gave up on SD card's a -long, long- time ago and now use a USB3 to Sata SSD adapter.
It enlarges the footprint of the PI but old time hard corruption of the sd card are gone.
An adapter is $11 (I have 4 of them, using since 2016) coupled with cheap 120 and 240gb SSD's.
The adapter I use is USB3S2SAT3CB, FWIW
The only main issue with SSD's is garbage collection, i.e. 'trim' support. To alleviate the somewhat, only use 30% or 40% of the SSD space (back to the 'space' issue again
If this is true Stellarmate, maybe open an issue to add the capabilities for system monitor, if does not exist already.