Sailfish is also going to be available with multiple Sony devices. Maybe Sony is the way to go with UB too?

Fairphone 2 now has new camera upgrade available and comes with next batch of phones, but it probably is not compatible with current version of UT?

https://www.fairphone.com/en/upgrade-fairphone2-camera/

Jolla is using Sony Xperia X as their reference device. Could that be easily ported to UBports also?

https://blog.jolla.com/sailfishx/

As i have understand, they have some kind of pact with Sony and are about to convert more Sony phones in the future.