So for now, chen is better of :

- keeping whatever chip he think would be the best easiest for him now.
(From what I've understood : basically a chip with decent spec, availble in low volume at a reasonnable price, with a ready-to-use PCB design)

- optionnally provide Android for non-power users.

- pay Jolla to provide SFOS with libhybris.


set a stretch goal to pay developpers at - e.g. OpenSUSE - to make a version of tumbleweed that can work over libhybris.
(or see if there's a community that picked up the ball after Ubuntu Touch and can be paid to adapt it to the phone).



Maybe at a laster point design a future phone with more linux friendly parts (hey, maybe by then AMD will release a low-power version of their mythical upcoming ARM CPU. Or maybe Nvidia would have released enough docs for Nouveau driver to be good on Tegra).
With USB and I2C pins :-D