This. Teenage Engineering, or the Playdate on a lower budget.
https://play.date/
just put nostr on a gameboy
call it nostrboy
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A custom cartridge. Love it.
i know there's a community that heavily customises and revamps old ipod touches
smth along those lines
Each cartridge is a different client
nsec is in the cartridge, your physical keys to sign notes on the gameboy client
