At the recent installation of the Most Rev. Siegfried Jwara, CMM as Archbishop of Durban it was possible to see his personal symbol on a banner in the sanctuary. I don’t call it a coat of arms because it is composed entirely of reproductions of paintings: one of the Good Shepherd, one of Dom Francis Pfanner, OCSO, the founder of Marianhill and a portrait of another cleric.
This. Isn’t. Heraldry.
Below is a poor quality image taken from a screenshot of the video of the installation. Apologies for the poor quality. Although, perhaps it’s better not to see it more clearly. I’ll say again that you may not simply put whatever you’d like on a shield and call it a coat of arms.