Hi! Congrats on your baby! I know you've tried everything, but I thought I'd pipe up. I took a pelvic alignment class from my yoga teacher and it is all about getting the baby into position. We learned a series of yoga moves to do every evening for about 10 minutes before bed. They also told us to sit on an exercise ball etc and stay OFF the couch. That anytime you have your knees higher than your hips and your leaned back like in a bucket seat the baby is being encouraged into the wrong position.
This is my first pregnancy and so I'm not sure of much, but maybe a yoga teacher might be able to help you? Anyway, I am sending you flipping mojo and hoping your wee one will flip around for you!