The reflector oven we used is one I designed and built. We've been using it for quite a number of years now and its withstood the test of time. There are some commercially available units similar to mine, but in my unbiased opinion, none are quite as good. Any experiences I've had have been very positive and I've never been worried in their presence. The wolves have been mostly curious about us and their gestures and body language seemed to make that fairly obvious.
Bears are another matter.
Basically, there are two types of potential bear attacks. One is the bear attacking you because its threatened, and the other is an act of predation where it views you as a food source. If you don't attract it with food and you give it time to get away from you, there should be no problem. Your photos are great. We're taking a short family trip in October and I'd like to have some framable photos when we return.