Having no idea what it would taste like, my only concern would be the actual look of the sauce. I've had foie a bunch of times but never cooked with it. I'm thinking it might be grainy looking. IDK, definitely post pics!
On a side note, I have some leftover duck fat in my freezer I was looking to incorporate into some BBQ...somehow. It's amazing the flavor you get, just a tablespoon on homefries, salt and pepper.
Oh, and you might want to have another sauce as some people are against foie, yadda yadda yadda.