Similarly, I had a nokia phone that would flip to a split keyboard on either side of the screen. I
LOVED taking notes on that thing... It wouldn't take much for me to be more than happy with something similar if it were easy enough to pair with a tablet for mobile data.
Aside, I really wish there were an open entertainment specification for cars over bluetooth. Where the onboard entertainment/navigation system were incredibly barebones, but when tethered to a device, the device would take control of those interfaces. Only entertainment and maybe a/c, where any onboard control interfaces would just trade screens between onboard/offboard controls.
My 2.5yo car already feels ancient, not that I loved the entertainment interfaces to begin with. And bluetooth has always been a bit of a sour point. Would still be nice to see a well testable standard for integration that worked across devices/platforms.