Finding apk or installing it is not a problem. The big huddle is google service on which more and more apps are relying (or google makes it like this).

This is where the android runtime in BB10 became less and less useful although there's hack or tweak to remove the google service dependency.

I don't know how alien dalvik works and handles but I really do hope it won't cause too much inconvenience to use android app properly.

I use iOS, Android, Window 10 mobile, BB10, Sailfish (for a short time) and Meego, but wired that I like the OS the most in the reserve order (Window 10 mobile is out of the pic).