Like others have said, definitely try a few distributions out via USB before committing. Also, you can dm me if you need help beyond what you find online.
Probably not all of them. The Voyager probes were launched in the 70s and they don't exactly need much encryption because they can only be programmed by someone with a massive transmitter.
Except that I'm running GrapheneOS and I can turn off my phone/put it in a faraday cage if I need to. I highly doubt either of those are going to be possible with always-on implants.
She's sick