You can do a pretty good job with a partial mash. You'll need some thought, but it can be done.
Use Wheat extract as your base. Just know the percentages of your extract. For example, IIRC Briess Wheat extract is 65/35 Wheat/Barley. Alexanders is 50/50.
For your partial mash, you'll need flaked oats at the very least. Raw wheat berries are traditional, but incredibly difficult to mill - they're like milling little rubber BBs. I've had good results with flaked wheat as a substitute; it's unmalted. The balance should be Pilsner malt from Europe. Not necessarily Belgian, as most Belgian brewers use German Pils malt (odd, but true). I'd do 2 lbs of Pils malt and a pound each of flaked grains. For procedure, follow DeathBrewer's outstanding tutorial. Make up the rest of the OG with Wheat extract and roll with your hops and spices.
Speaking of hops and spices, you've witnessed yet another round of the "dried peel vs. fresh zest" argument. I made my position clear in support of the traditional ingredient, because I think the people who support zest do so for the wrong reasons.
Now let me add a few more observations.
Don't overhop, and for heaven's sake don't use flavoring or aroma hops. Most of the bitterness and all of the flavor must come from the spices, not hops. That's why the commercial examples use bitter peel. This is precisely why I think supporters of zest are wrong; there is no bitterness inherent in the zest to perform this necessary function. In fact, you're deliberately told to leave the bitterness-carrying pith behind.
Feel free to play around with spices. While coriander and orange peel are the
de rigeur spices, you can use others to great effect. Paradise seed, cardamom, rosemary, star anise, chamomile - all of these have been used. Wit is a bucolic throwback to the 15th century, when you brewed your harvest ales for rapid consumption and balanced the malt with what you had around. It definitely had characteristics of gruit beer. So go nuts with your spice cabinet.
Definitely do use a dedicated Belgian wheat strain. Wyeast's Wit and Forbidden Fruit have given good results for me. I know nothing of the White Labs offerings.
Have fun with your Wit journey. It's a fun and very free style to brew. As long as it tastes good to you, it doesn't matter what jerks like me say!
Bob