My suggestion is to go to GIs who specialize in IBD rather than to general GIs. Both Mass General and Beth Israel Deaconess have active IBD centers or programs.
One doc I have heard of at Beth Israel is Adam Cheifetz, MD. I haven't met him, so I don't know whether he open-minded to new treatments in the way you are seeking. But I do know he is an active researcher trying to improve Crohn's care, so he may be worth a shot. Or perhaps you can peruse the interests and specialties of the medical staffs at the two IBD centers and see of any of the other docs sounds like what you are looking for.