No, the Stan's rims are not UST-compatible. Neither are Bontragers. There are currently no UST-specific 29er rims, and, given your weight, you'll potentially experience bad times trying to run a converted regular-tire/sealed up rim setup on a 29er (hope you don't ride on rocks). Mavic will be releasing a 29er wheels fairly soon, and it does look pretty damn nice. We may well start seeing 29er UST tires, too, though they'll be from the like of Hutchinson and Michelin only, and will probably weigh over 1,000g each.
Best to wait on the Mavic then, or go with an Industry 9 Stan's Flow wheelset. The I9 stuff is amazing, but we've never had a single order for their hubs alone. Everyone wants the wheelsets, and with good reason. They're just plain excellent, but again, they're not UST.
So yes, I'll be waiting for Mavic. Normally I also only run true UST tires, so it'll be interesting to see what comes out there. I've run a lot of converted tires, but they don't work as well usually, so I've gone with only UST. In 26" wheel land, there are plenty of UST choices in the 2.3-2.5 (and upwards) range these days, so it's no longer a problem. But in 29er land, it may be a challenge for a while.