Oh god man, you’re my saviour 
Got exactly the same pb as yours on jolla 1… No aliendavilk even installed, everything was a green light, every partition less than 50% full, now really angry against sailfish…
I am following your steps, I hope I’ll sort this out too!
Perhaps some other package needed to be upgraded for it to work?
I got some errors like you while trying to refresh packages after installing packagekit; they were solved by installing these 3:
rpm -Uvh ssu-1.0.8-1.17.8.jolla.armv7hl.rpm ssu-declarative-1.0.8-1.17.8.jolla.armv7hl.rpm ssu-network-proxy-plugin-1.0.8-1.17.8.jolla.armv7hl.rpm
I am fighting with ugliness here, both packages found in the cache are providing incompatible deps 
rpm -qlR telepathy-accounts-signon-0.1.27.3-1.4.1.jolla.armv7hl | grep libaccounts-glib
libaccounts-glib.so.0
rpm -qlP ./libaccounts-glib-1.24+git3-1.6.4.jolla.armv7hl.rpm | grep libaccounts-glib.so
libaccounts-glib.so.1
/usr/lib/libaccounts-glib.so.1
but after uninstalling a bunch of all the ones requiring libaccounts-glib.so.0, a:
pkcon update
did the job.
Thanks for you insight, let’s hope that not too much people will land in this post!