My response explaining the work that needs to be done on implementing alternatives to Play Services and how that will work:
reddit.com/r/GrapheneOS/c
A lot of these are really standard AOSP APIs that are typically provided by Play Services but fully support other implementations.
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Even for implementing actual Play Services APIs, it can be done without a terrible permission granting the ability to fake the signature checks that are a core part of the security model. It can be specific to the Play Services signature and it can be scoped to where it's needed.
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Yes, that's one of the features which needs to be implemented. Geocoding, text-to-speech, speech-to-text and assorted others things are also included and these can all be done without needing any Google services. Geocoding could have both a remote and local implementation too.