> There's a company which sells something like this, as "Prepper Disk".

They mentioned it in their video: https://www.youtube.com/watch?v=P_wt-2P-WBk&t=350

I had thought of building those exact Civil Defense devices a few years ago. Maybe it’s a viable product?

I like that it's an SD-card based RPi: something known to fail under completely normal usage

For the margins a $280 MSRP allows you'd think they'd at least try a little bit: maybe hook people up with the RPi Compute Module which has eMMC onboard