Getting a value from a higher databinding path - xaml

Question

I have an object that contains a control defined in a control template, and an object which it gets notifications from.
These notification object keeps track of the status of the object, which translates on the screen to the colour in this instance, although they are used in other areas of the UI to reflect the state of these objects.
The rectangle colour changes fine on the status change, but I have another property which provides the foreground colour of the text.
However, because of the ContentPresenter getting the text from the control, I can no longer get the foreground colour with the TextBlock.Foreground setter in the style, as the binding is pointing elsewhere.
I could put the name of the object in the notification object as well which would get rid of this question and problem, but I have run up against a similar issue in other places, and as I am new to WPF would like to know the way to do it.
This is the main relevant part of the ControlTemplate 'AnimatedTemplate':
<Rectangle x:Name="ColourFill" Stroke="White" RadiusX="5" RadiusY="5">
<Rectangle.Fill>
<SolidColorBrush Color="{Binding Path=FillColour}"/>
</Rectangle.Fill>
<Rectangle.Style>
<Style>
<Style.Triggers>
<DataTrigger Binding="{Binding Path=Active}" Value="True" >
<DataTrigger.EnterActions>
<BeginStoryboard> ... </BeginStoryboard>
</DataTrigger.EnterActions>
</DataTrigger>
</Style.Triggers>
</Style>
</Rectangle.Style>
</Rectangle>
<ContentPresenter HorizontalAlignment="Center"
VerticalAlignment="Center"
Content="{TemplateBinding Content}"
ContentTemplate="{TemplateBinding ContentTemplate}"
Margin="2"
TextBlock.FontFamily="Segoe UI"
TextBlock.FontWeight="Bold">
<ContentPresenter.Style>
<Style>
<Setter Property="TextBlock.FontSize"
Value="{Binding Path=Content, RelativeSource={RelativeSource TemplatedParent},
Converter={StaticResource PushPinContentSizeConverter}}" />
<Setter Property="TextBlock.Foreground"
Value="{Binding Path=TextColour}"/>
</Style>
</ContentPresenter.Style>
</ContentPresenter>
this is created with:
ControlTemplate template = (ControlTemplate)_window.FindResource("AnimatedTemplate");
Control c = new ContentControl();
c.Template = template;
c.SetValue(ContentControl.ContentProperty, displayName);
c.DataContext = <the notification object referred to as the first binding>
_window.d1overlay.Children.Add(c);