My 2 cents on this device: you are replicating the 1980s "computer in the keyboard". Back then, the issue was the lack of screens, so TV were used instead.
For educational purposes, the same problem exist today: however, kids will not have a space HDMI screen with a micro HDMI cable.
The replacement screen that most people have is different: it's a smartphone, as there are more smartphones than TVs.
So a "notch" or receptacle on top on the keyboard, to secure a smartphone into place, would be helpful: the use case would be powering the 400 from the smartphone AC adapter (kids may not have a spare adapter matching the pi4 power requirements), plugging the phone into the 400 using a USB cable to keep the phone charged, use the phone as the screen - without it falling out and breaking, or hanging by a cable.
Android being finicky, you may not be able to have autodetection/USB gadget mode, but a remote desktop solution would go a long way.
It is not possible at the moment, given the 400 power requirements, but newer/more powerful AC adapters will eventually be more common.
This leaves the notch, which you may want to consider in the next revision
For educational purposes, the same problem exist today: however, kids will not have a space HDMI screen with a micro HDMI cable.
The replacement screen that most people have is different: it's a smartphone, as there are more smartphones than TVs.
So a "notch" or receptacle on top on the keyboard, to secure a smartphone into place, would be helpful: the use case would be powering the 400 from the smartphone AC adapter (kids may not have a spare adapter matching the pi4 power requirements), plugging the phone into the 400 using a USB cable to keep the phone charged, use the phone as the screen - without it falling out and breaking, or hanging by a cable.
Android being finicky, you may not be able to have autodetection/USB gadget mode, but a remote desktop solution would go a long way.
It is not possible at the moment, given the 400 power requirements, but newer/more powerful AC adapters will eventually be more common.
This leaves the notch, which you may want to consider in the next revision