I'm not a fan of S-33 myself, and I wouldn't describe it as a "Belgian" yeast at all. AFAIK it's the Edme strain, so it's British. It produces quite a few esters, which is likely why they're trying to market it the way they are.
Safbrew T-58 is much closer to a trappist or Belgian yeast IMO, and the only dry yeast I know of that comes close to producing trappist flavors. It produces a lot of black pepper phenols, and if fermented warmer it also throws some nice fruity esters, usually bubble gum and/or banana. Not my favorite Belgian yeast, but not terrible either.
For a dry yeast in a Belgian beer, there's no need for a starter IMO. Dry yeast packets have a lot more cells than liquid, and since you're trying to get more esters out of it, underpitching slightly isn't a bad thing.
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