It's billed as a handheld gaming system but you don't have to play games on it.
Runs Windows 10 on a 5.9-inch 1920 x 1080 screen. Atom processor.
Whether it will lever get made is another matter (it's an ex-Kickstarter project now taking pre-orders), but the approach is interesting.
https://www.indiegogo.com/projects/gemini-pda-android-linux-...
Community ROMS? Keep an eye on Halium, unifying a common base for porting sailfish/luneos/plasma mobile/ubuntu; with anbox for Android apps.