Far from I know the Gemini PDA could be a choice.
It has 20nm mediatek x20(2x a72+8x a53 cores)
4G RAM 64G emmc+TF Card support.
6inch 1080p ips display(multi-touch capability)
(2015 spec. Not good for games because of over-heating problem, buy fine for daily usage)
It does come with a QWERTY keyboard. I think it was Linux & Android7.1 dual-boot.(open-source driver as well)
It comes from $249-$299(an advaced edition with 4G support)
Maybe you could take a look. I didn't have one myself, so make your own choice.

https://www.indiegogo.com/projects/g...le-device--2#/