First, yes, never clamp anything to a carbon fork except maybe a computer sensor. There are a couple of CF touring forks on the market, but they're not common and not cheap.
Second, if the fork has no v=brake/cantilever bosses, you're stuck with the road calipers it comes with (and that seems likely to be the case). And yes, that will limit your tire size. On that particular bike, with long-reach calipers, I think you'd be OK with 700x28c tires, and there are some pretty decent touring tires available in that size. Also 'cross tires, like the Avocet Cross II K, which is pretty bullet-proof.
The Sequoia's gearing is a little high for loaded touring as well, unless you plan to ride only in the flatlands. And you'd have to figure out a way to get a fender on the front.