Edit: getting downvoted so for clarity this is the part of your comment I'm referring to: MicroG already distributes a fork of LineageOS that includes MicroG
They have LineageOS builds with MicroG integrated that are technically a fork, mostly because they add permission API to spoof Google apps, that got rejected upstream. Also they ship with two location backends (Mozilla and Nominatim), though disabled by default, and FDroid comes preinstalled as a system app.