Finally created something that builds using
https://medium.com/flutter-community/creating-a-flutter-plugin-dialog-box-78adbff15fe
* the start-point is to create a new flutter plugin project using AndroidStudio

Running!
* you can load the main folder as a dart project and run the example/main.dart
* you can also load the /android/build.gradle into AndroidStuio to run that
* flutter build ios --no-codesign for the /example/ project workse well
* xCode can load /example/ios/Runner.xcworkspace