I haven’t had either of them, but they both breweries do not have reputations for making “authentic” Belgian beers. As a result I would guess that the beers are similar to Blue Moon in that they use a clean American ale yeast instead of a more flavorful Belgian strain.
The “standard” recipe for a Belgian Wit is something like 65% pils, 30% unmalted wheat, 5% unmalted oats. So you could do that, or you could use malted wheat which is a bit easier to work with and domestic 2-row (which is almost certainly what they are using).
I would aim for ~15 IBUs from a single bittering addition, use something like hallertau if you want to be authentic, but pretty much anything will work for such a small dose.
You are right on the coriander (.5-1 oz) and orange peel (.75-1.5 oz). I would go with fresh orange zest, I find it much tastier than the stuff from the homebrew store. I also like a few grams of chamomile added at the end of the boil.
Hope that helps, good luck brewing.