TL;DR
-
Google has made it harder to build custom Android ROMs for Pixel phones by omitting their device trees and driver binaries from the latest AOSP release.
-
The company says this is because it’s shifting its AOSP reference target from Pixel hardware to a virtual device called “Cuttlefish” to be more neutral.
-
While Google insists AOSP isn’t going away, developers must now reverse-engineer changes, making the process for supporting Pixel devices more difficult.
There are some 7-8" tablets that could probably fit in a pocket, but finding the perfect mix of Linux compatibility and cell chip is going to be difficult.
However, I see a few Linux tablets out there that have to be all runs, because Linux tablets are a pretty small niche, so it might not be that expensive to build one yourself.