Not sure if this is what is wanted but you can create an example diagram in Sparx EA then export the package it is in to XMI. If you have an MDG you can add a reference to that XMI with the example diagram and use the wizard feature to create a copy of the example in a similar fashion to Core modelling use case. I did something similar with all the ArchiMate Viewpoints and the entry in MDG was something like this
<ModelTemplates>
<Model name="Viewpoints" description="Examples of viewpoints for Enterprise Architecture" location="Viewpoints.xml" default="yes" icon="34" filter=""/>
</ModelTemplates>