How can I intercept the value from NSResponder and use that string? (SwiftUI)

import SwiftUI
import AppKit

struct ContentView: View {
    private let emojiResponder = EmojiResponder()

    var body: some View {
        Button {
            // open the emoji picker
            if let window = NSApplication.shared.keyWindow {
                window.makeFirstResponder(emojiResponder)
                DispatchQueue.main.asyncAfter(deadline: .now() + 0.1) {
                    NSApp.orderFrontCharacterPalette(nil)
                }
            }
        } label: {
            Text("Emoji?")
        }
        .onAppear {
            emojiResponder.onEmojiSelected = { selectedEmoji in
                print(selectedEmoji)
            }
        }
    }
}

// Custom Emoji NSResponder
class EmojiResponder: NSResponder {
    var onEmojiSelected: ((String) -> Void)?

    // use insertTest method from NSResponder
    // I assume this allows me to get the input 
    override func insertText(_ insertString: Any) {
        guard let selectedEmoji = insertString as? String else { return }
        onEmojiSelected?(selectedEmoji)
        print(selectedEmoji)
    }
}