XAML: Custom Binding in DataTemplate for use in GridViewColumn CellTemplate

I have the following DataTemplate in resources that I would like to reuse throughout a GridView.

<Window.Resources><DataTemplate x:Key="NumericalDataTemplate" DataType="GridViewColumn.CellTemplate"><StackPanel Orientation="Horizontal" Height="32"><TextBlock Text="{Binding MyLength}" VerticalAlignment="Center"                     HorizontalAlignment="Center"><TextBlock.Style><Style TargetType="{x:Type TextBlock}"><Setter Property="Visibility" Value="Visible" /><Style.Triggers><DataTrigger Binding="{Binding PropertyEditable}" Value="True"><Setter Property="Visibility" Value="Collapsed" /></DataTrigger></Style.Triggers></Style></TextBlock.Style></TextBlock></StackPanel></DataTemplate></Window.Resources>

Which is implemented as follows.

<GridViewColumn Header="MyLength" Width="80"                CellTemplate="{StaticResource NumericalDataTemplate}" />

I would like change the Binding of the TextBlock (Currently Text={Binding MyLength} ) so that it can use a custom binding for each GridViewColumn Cell Template (eg MyHeight, MyWeight etc).

The way I envisaged doing this is changing the Binding of the TextBlock to simply use {Binding} and having the GridViewColumn set the Binding. However, I'm not sure where or how to do this, as setting the DisplayMemberValue to {Binding MyLength} (for example) simply overrides the template.

I would preferably like to do this entirely in XAML.