How to change color of FontImageSource programmatically?

public partial class MainPage : ContentPage
{
 private Button PhonePortrait;

public MainPage()
 {
        PhonePortrait = new Button();
        PhonePortrait.ImageSource = new FontImageSource
        {
            FontFamily = "IonIcons",
 Glyph = "\uf24e",
 Color = Color.FromArgb("#999999"),
 Size = 28
 };
        
	InitializeComponent();
        this.Content = PhonePortrait;
    }

    protected override void OnAppearing()
 {
        base.OnAppearing();

 // Option 1 - try to access the original value (WARNING: This only works if the Color property has property changed notifications)
 // According to Microsoft's MAUI source code, it is NOT observable https://github.com/dotnet/maui/blob/c096b3a03b4d56a0b56660298559db4791a8d489/src/Core/src/ImageSources/IFontImageSource.cs#L6 
 (PhonePortrait.ImageSource as FontImageSource).Color = Color.FromArgb("#FF0000");

 // Option 2 - This is really your only option, set a new value
 PhonePortrait.ImageSource = new FontImageSource
        {
            FontFamily = "IonIcons",
 Glyph = "\uf24e",
 Color = Color.FromArgb("#FF0000"),
 Size = 28
 };
    }
}

public static class Extensions
{
    public static void UpdateIcon(
        this RadButton btn,
        string fontFamily = "IonIcons",
        string glyph = "\uf24e",
        double size = 28,
        Color color = null)
    {
        if (color == null)
            throw new ArgumentNullException("Whoops, forgot to set the Color value");

        btn.ImageSource = new FontImageSource
        {
            FontFamily = fontFamily,
            Glyph = glyph,
            Color = color,
            Size = size
        };
    }
}

PhonePortrait.UpdateIcon(color: Color.FromArgb("#FF0000"));