Here is a look at a keyboard option “The Other Half” for Jolla Phone.
This is probably what Jolla Phone was meant to aspire to from the very beginning – an actual other half that brings something other than some ambience changes and more like the recent post with the OLED screen.
It has an interesting “magnet” feature. It’s not a slider, instead the keyboard part magnetically snaps on. According to the OP, the magnets do not affect the phone’s function. He says later that “modern phones aren’t affected by magnets” but several I’ve used sometimes find even a magnet on a case to slightly confuse the compass.