Use flutter_local_notifications plugin in Isolate - flutter

Question

I have some business logic that requires to create a number of scheduled notifications, from 1 to n with n being defined prior running the code that loops until it reaches n. I have to loop from 1 to n as I use each count as index to access some elements of a list.
Psuedo code for it is something like:
for(int i=1; i<=50; i++){
// below is a function that calls into an initialized instace of FlutterLocalNotificationsPlugin()
// that I use to access the notification scheduler helper
createNotification(i);
}
Running it seems fine both on my emulator and actual device. However, I found out that running that part of the code on older or weaker-specced device would cause the UI to momentarily be unresponsive or laggy. From my research, I am thinking that the logic and code that I am using is too taxing for the Main Isolate and should be put on a separate one for parallel execution that will free up my Main Isolate to maintain my UI's performance.
Below is the code for the high-level class called by the Flutter compute helper for Isolates.
test(int _num) async {
FlutterLocalNotificationsPlugin flutterLocalNotificationsPlugin =
FlutterLocalNotificationsPlugin();
var android = AndroidInitializationSettings('#mipmap/ic_launcher');
var iOS = IOSInitializationSettings(
requestSoundPermission: false,
requestBadgePermission: false,
requestAlertPermission: false,
);
var initializationSettings = InitializationSettings(android, iOS);
var androidDetails = AndroidNotificationDetails(
'channelId',
'channelName',
'channelDescription',
importance: Importance.Max,
priority: Priority.High,
);
var iOSDetails = IOSNotificationDetails();
NotificationDetails platformChannelSpecifics = NotificationDetails(androidDetails, iOSDetails);
await flutterLocalNotificationsPlugin.initialize(initializationSettings); // Error appears in this part
int total = 0;
for (int i = 0; i < _num; i++) {
flutterLocalNotificationsPlugin.schedule(0, 'title', 'body',
DateTime.now().add(Duration(seconds: 5)), platformChannelSpecifics);
total += 1;
}
}
I call the test function like below.
await compute(test, 100000000);
However, I am having the error below:
Exception has occurred.
FlutterError (ServicesBinding.defaultBinaryMessenger was accessed before the binding was initialized.
If you're running an application and need to access the binary messenger before `runApp()` has been called (for example, during plugin initialization), then you need to explicitly call the `WidgetsFlutterBinding.ensureInitialized()` first.
If you're running a test, you can call the `TestWidgetsFlutterBinding.ensureInitialized()` as the first line in your test's `main()` method to initialize the binding.)
I have indeed followed what was in the error message which is also the same recommendation of others by adding a line of code in the main() body of the Flutter app but was not able to make it work as well.
It seems that I cannot access the plugin from the top-level class used for the Isolate. I'm hoping you guys can help or atleast suggest an improvement on what I am currently doing that may help. Thank you!