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If a phone can’t be flashed to a different OS, then it can be degoogled with adb via pc, or Shizuku + Canta directly on the phone. There are other apps besides Canta that also work, but Canta is the easiest for non-techies to use.
Never buy an Apple product if you value sovereignty. Androids can be tweaked to cut out big brother.
Have you tried StreetComplete? It let’s you tweak OSM to help develop the map.