I have the exact same requirements. Too bad the Chuwi Hi8 Pro is taking so long be be released.
Another option is the Teclast X80 Plus. This has the new Cherry Trail cpu, HDMI out (4k) but doesn’t have a full hd screen. The Cube iWork 8 ditto, it was reviewed on the frontpage yesterday.
The dual boot can easily be solved by removing the Android partition. I like dual boots because you never know when you might need it in the future and you can always restore it back to two partitions.
Let me know what you decide. and why