How to avoid using GlobalKey when using MaterialApp builder method - flutter

Question

I've setup my project with a Scaffold wrapper so all the routes have the AppBar and SideDrawer widgets.
I'm quite annoyed having to pass around my _navigatorKey all the time and running into this error: "Navigator operation requested with a context that does not include a Navigator".
Also when trying to do very specific things like open a dialog I have to pass navigatorKey.currentContext which throws this error: "The argument type 'BuildContext?' can't be assigned to the parameter type 'BuildContext'".
Also when using any widget requiring an overlay like TextFormField or DropdownButton I'm running into this error: "No Overlay widget found.".
I've been able to fix all these issues with roundabout methods that I don't like, but more and more issues keep coming up because of this GlobalKey usage.
Is there a better way to wrap my routes and avoid using GlobalKey?
import 'package:flutter/material.dart';
import 'package:get_it_mixin/get_it_mixin.dart';
import 'package:provider/provider.dart';
import 'pages/blog_page.dart';
import 'pages/landing_page/landing_page.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget with GetItMixin {
MyApp({Key? key}) : super(key: key);
final GlobalKey<NavigatorState> _navigatorKey = GlobalKey<NavigatorState>();
#override
Widget build(BuildContext context) {
return MultiProvider(
providers: [
ChangeNotifierProvider<MenuProvider>(
create: (_) => MenuProvider(),
),
ChangeNotifierProvider<MarkdownProvider>(
create: (_) => MarkdownProvider(),
),
],
builder: (context, child) {
return MaterialApp(
title: "test",
navigatorKey: _navigatorKey,
debugShowCheckedModeBanner: false,
builder: (context, child) {
return Overlay(
initialEntries: [
OverlayEntry(
builder: (context) =>
MyScaffold(child: child!, navigatorKey: _navigatorKey),
),
],
);
},
home: const LandingPage(),
routes: {
LandingPage.routeName: (context) => const LandingPage(),
BlogPage.routeName: (context) => const BlogPage(),
MarkdownPage.routeName: (context) => const MarkdownPage(),
},
);
},
);
}
}