Tough problem...You'll have major bass problems and imaging will be off potentially given your description. The only think I can think of would be a pair of Vandersteen Quatros or Model 5/5as. The main reason is that you'll need the bass sculpting ability they have. Plus, they won't be affected as much by the placement. Toe in and tilt will be critical too. Let us know what you end up with and how you like it please.
Good luck!
Good luck!