Braden: Most sensical to me would be:

-replace the Aquitaine elements of your Arms (top left) with Lorraine ones
-have Metz as a separate shield (a la my signature)

do you want me to try that out?

Culture:

You could just see that. IMO the Fleur de Lys should perhaps go further down to fill all that blue space, but let me know.

Spoiler Alert, click show to read: