How can I reduce RadioButton binding code?

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Here would be an improvement on my answer on a related question, utilizing the single selection mode of ListBoxes:

<ListBox SelectionMode="Single" SelectedItem="{Binding EnumValue}"
        Style="{StaticResource BorderlessStyle}">
    <ListBox.Resources>
        <ObjectDataProvider x:Key="items" MethodName="GetValues"
                            ObjectType="{x:Type sys:Enum}">
            <ObjectDataProvider.MethodParameters>
                <x:Type TypeName="local:MainWindow+TestEnum" />
            </ObjectDataProvider.MethodParameters>
        </ObjectDataProvider>
    </ListBox.Resources>
    <ListBox.ItemsSource>
        <Binding Source="{StaticResource items}" />
    </ListBox.ItemsSource>
    <ListBox.ItemsPanel>
        <ItemsPanelTemplate>
            <!-- Automatic grid layout, adjust as needed -->
            <UniformGrid Columns="2" />
        </ItemsPanelTemplate>
    </ListBox.ItemsPanel>
    <ListBox.ItemTemplate>
        <DataTemplate>
            <RadioButton Content="{Binding}"
                    IsChecked="{Binding IsSelected, RelativeSource={RelativeSource AncestorType=ListBoxItem}}" />
        </DataTemplate>
    </ListBox.ItemTemplate>
</ListBox>

The style to make the ListBox itself disappear:

<Style x:Key="BorderlessStyle" TargetType="ListBox">
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="ListBox">
                <ItemsPresenter />
            </ControlTemplate>
        </Setter.Value>
    </Setter>
    <Setter Property="ItemContainerStyle">
        <Setter.Value>
            <Style TargetType="ListBoxItem">
                <Setter Property="Template">
                    <Setter.Value>
                        <ControlTemplate TargetType="ListBoxItem">
                            <ContentPresenter />
                        </ControlTemplate>
                    </Setter.Value>
                </Setter>
            </Style>
        </Setter.Value>
    </Setter>
</Style>

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