First thing I'd do is email Surly, see if they have any suggestions, they're good about replying to these kinds of inquiries. I'd assume the frame can take an IH but there may be some "gotchas." The geometry may also be less than optimal for carrying loads.

I'm a little curious as to why you selected the Alfine. For what it's worth, I've seen a lot of people using Shimano Nexus "Red Band" IH's, none using the Alfine for touring.

I'd get a bike computer. You don't need anything fancy, but I find it very helpful to keep track of time on the bike and to help figure out how long you've got until your next destination. Keep in mind that you need to drink and consume calories while you're riding; rule of thumb is 500ml of liquid and 250 calories.

I'd skip on the dyno hub as well. There are plenty of LED lights that take AA batteries and last a long time.

Last but not least, I highly recommend you do some short tours before what I assume is a big tour. That way you can figure out what works and what doesn't, and won't have to make major adjustments when you're on the road.