With latest system update (QF3 for my G9350), error 'conflicts with an existing package by the same name' when install S8 AOD apk (from apkmirror above) is gone now. :)
Below is an testing version AOD apk (1.6.174-10251635), with which you can use any pic as AOD.
No quicksetting for GPS, but the location setting is searchable in settings.
You need to request on miui site with your mi account. Follow the guide there to unlock the bootloader after your account is approved.
It works fine on 5.11.19 dev version.