(whether that really will improve the accuracy is debatable) but the Librem 5 should support Galileo from Day 1 as the GNSS chip is multi-constellation (GPS/Galileo/Glonass/BeiDou/QZSS). Source: Comparing specs of upcoming Linux phones
AML is discussed extensively here: Advanced Mobile Location when calling emergency services and should be mandated from 1 Jan 2022 so not as urgent as suggested.