This is great!
Thanks for the hard work and effort.
I managed to get 12.1 working with sfdroid, but needed a second attempt.

After first attempt, i tried to start sfdroid and only had the Android Bootanimation with 60-80% cpu usage indefinetly.

I tried all over again, this time wiping all cache and data, then doing the exact same procedure successfully.

It would be really cool if GPS would work one day.
My main usage of Alien Dalvik on Jolla is navigation.
Waze and Here Maps are running perfectly already on sfdroid.

EDIT:
Here is a log of a crash when tapping on the wifi selector field in shortcuts pulldown menue.