I received the latest service DVD yesterday. It has all 2008 models.
I took a quick look at the grab handle area of the Fusion, and the same area on the Escape, but not at the restaint systems. I got pretty busy yesterday, and I'm in the office today for CPR training (of all things!), so I didn't have any time to look.
My initial guess is that the areas look the same, and that one of the Fusion's grab handles would fit without interfering with the operation of the side curtain airbags, but I want to look at the restraint systems to make sure. There's also a recess in the Fusion's headliner around each of the four grab handles that won't be in the Escape's headliner, but you still may be able to use it.