I wouldn't homebirth a breech baby, I don't think. But for me, it's totally beside the point - there aren't even doctors around here who will deliver a breech baby naturally.
I've heard that wearing a pregnancy support belt can help get your baby into a better position for birth. It kind of makes sense, if your stomach muscles are shot and your baby has too much room to move, then the support belt takes over for the muscles and puts the baby back where it should be. Could be worth a try anyways. I've worn a blanqi pregnancy support tank for the past 20 weeks or so, and it has helped my back out substantially, and it's comfortable - no straps or velcro, more like a sports bra for your belly. They're kind of expensive, but I do love it. This baby has been head-down from the time they started checking, but I don't know if that's because of the support, necessarily. All my babies go head-down pretty early. I'm just hoping for a LOA baby, not a posterior one!