Late responding to this but you can look at running a mobile Linux distro on a Pixel 3a, OnePlus 6/T & probably a few others. Gives you pocketable Linux like the Pinephone but with hardware that is easier to tolerate. This is coming from somebody who ran a Pinephone as a daily driver for 2 years. It's doable but leaves much to be desired. I've been considering snagging up one of these devices myself.