Wouldn't be concerned with the baking. All the local rally lads use Carlow Coatings and no issues at all - and their alloys would get a lot more abuse than your average road-car. Also the powder coating seems thicker than the wet paint from what I have seen. The finish is definitely a little different from wet paint... less like glass... but that said this is only visible from inches away and because it is tougher and coloured all the way through less chance of chips happening, or even if they happen less visible.
No experience with Wheel Wizards, but am sure must be OK seeing the feedback from Rob and others.
BTW, if you wanted them painted rather than powder coated, my local body repair shop does a set of alloys for €200 and does a good job. He'd need them for two days though between prep / paint / dry... and he also advises that any painted wheels are left for a few days before refitting tyres and nuts - paint needs to properly cure out and this goes for any place.