Play along - create a PinePhone keyboard

[Michael Arthur Long]

https://en.wikipedia.org/wiki/Sony_Vaio_P_series
6*17 keys is too big or not?

I had a Vaio P. It wasn't exactly something that would fit on your pocket.
But the aspect ratio(2.08:1) is pretty close to the Pinephone's screen(18:9 or 2:1) sounds like a good place to start from, but the keys might end up being too small(I haven't checked).

Alternatively, I have a foldable keyboard(like the iClever BK03) which is slightly thicker and wider than the Pinephone(it'll block VOL and POWER buttons). But it might be possible to redesign it to fit. The case itself also appears unnecessarily thick and it may be possible to redesign the hinges to be more compact.
Although it may be costly, I've just had the idea of downsizing the bottom row and having it wrap around the edges so that it'll fit the Pinephone profile and possibly preventing you having to adapt to it too much. Maybe even use it additional keys(media, à la Nokia 5300) when folded.

However that would be outside the scope of this project since it's a compact full keyboard(typed with all fingers) instead of a small thumb board like the N900, and probably wouldn't be as durable as the N900's keyboard(but then again, Nokia).