Looking for keyboard and screen combo, does this hardware exist?

So I was thinking it would be really nice to have my SteamDeck in my bag, but connect it to a device that's a combination of a small touchscreen and keyboard. Ideally it would just connect with USB-C and perhaps have its own power source for the screen? Something kind of like an old Cybiko(pictured), but all the computing would be done on the deck.

Is this a thing that's been made or has anyone DIY'd something like this yet? I've searched for it, but can't even find anything like the concept 😩