I think T-58 could do a decent Wit, I'd be concerned with it under attenuation though. While I read that it could be an under-attenuator, I tried to counter that by recently throwing it at my standard Saison grist and mash schedule (mashed high 140's, cane sugar in the boil, and higher ferment temps - 76-78f), and it still only finished at 1.015. Distinctly Belgian esters, but lots of pear, honey, and melon character - much more like a Tripel than a Saison, though faint peppery notes emerge as the beer warms. Main complaint is the heavy mouthfeel for what should be a crisp style. Good flavor\aroma though, I'll use it again.