If anybody running 1.6-s-20221201239247-dev-FP3 and installing the /e/OS microG version with Exposure Notifications could give feedback whether microG works afterwards (doesn’t keep stopping all the time, Settings - System - Advanced - MicroG works), it would be helpful.
(This didn’t work for me with 1.5.1-s-20221103231515-dev-FP3.)