I have not, but I'm intrigued (despite just finishing lunch ... always room for more food!

).
The first question that comes to mind is about the rind. It's edible, though not to everyone's taste, and I'm not sure if it would complement the eggs.
I also wonder about brie's melting point. I think that if the omelette were too hot when the cheese is added as a filling, it might get a bit sloppy. (And adding it to the eggs before cooking is surely out of the question, though that works nicely with feta.)