Ah. I don't think it's worth the effort then. Running a Nostr client styled for that device would be cool though. I'm planning to build a lurking client when I get out of school (to learn the basics of Nostr clients). Maybe I can look into porting it to something like this. Fantasy vs work involved often have to be balanced 😂
Discussion
It would be cool to have it as a functioning signing device if it could be done securely. 🤣 The cartridge that slides into the unit houses the RPi and SD card. So you could have one cartridge as the game emulator and another as the signer. Make labels on them for whatever you want anyone to believe they are. Hiding in plain sight.