I doubt you're going to find an allopathic (MD/ ~DO) in the US who's going to offer or debate the merits of various alternative therapies for UC. You'll probably have to venture out on your own and hope for a doctor who supports your decisions.
I saw a naturopath MD in Germany a couple times. He had a very different approach, and some of his suggestions definitely helped, but it's hard to manage such a long-distance relationship. Some of his suggestions, like having all my amalgam fillings replaced, are a little out there by US standards, but they do fit with German practice.
If I had tried every other conventional treatment besides Remicade, I'd be more interested in making sure my doc will open the necessary doors to surgery, with or without Remicade. You might one day find yourself in a tight spot, and I found the hard way that a stubborn doc will stand in the way, even when quality of life is nil.
In any case, it's a good insurance policy to make sure you and your doc are on the same page through the continuum of UC options.
Colon cancer risk after 8-10 years of UC is said to be about 25% higher than the general population. The general population has about a 3-4% risk of colon cancer, so that increased risk translates to 4-5% overall risk. It's very small. It does increase again, though, after the second decade.