Aurora OS devices - #8 by kaktux take a look for yourself.
Other than them being -as it seems- run to the mil oem devices the “problem” is that a phone that will run SFOS must be designed with a SFOS philosophy in mind (gestures etc). That is also a problem for the xperia devices that jolla uses. Slapping SFOS on any device might work but doesn’t make for a great experience.