That would be a beast and probably look quite funny being the huge size of the Excursion.To go in the other direction, I'd love a 2 door Expy. A la full sized Bronco.
I had a 91 Ramcharger that was a big boxy Beast. It wasn't too bad getting to the back seat as I had a young child at the time and had to flip the seat forward hop in there on my knee and put his car seat in the base every time.
It did get annoying though and that's why I got rid of it and got my four-door Durango. Plus I'm addicted to 3rd row seating now whether I use it or not.