Sony’s AOSP on Xperia Open Devices page: https://developer.sony.com/open-source/aosp-on-xperia-open-devices
With the recent activity around Google restricting sideloading and not releasing device trees for Pixel, this is a possible alternative. I haven’t tried it, but intend to switch to a Sony device for my next phone.
I just checked my Cell Provider, they no longer offer Sony Xperia 10 phones!
They do offer a “Sonim XP10” which I find absolutely hilarious! It is the most blatant case of Trade Dress abuse since the Samsung Blackjack!