Hi Phil! The pad on my orthotic is behind the ball, sort of between the ball and the arch. It's a dome shape. As your weight moves forward, it takes some of the pressure from the ball. I've seen a similar product in dance stores occasionally.
I've also rigged some home-made pads. For specific painful spots on the bottom of the foot, I get some molefoam (moleskin with foam padding) from the drug store, cut it to fit the front of my foot, cut out a hole in the middle wherever the pain in, and slap it on my foot with the hole over the painful spot. That way, the painful spot gets little or no pressure. I've found the best drug store inserts for painful joints are Dr. Scholl's memory foam ones. They are softer than gel or regular foam. I've also had some luck with toe spacers between my big and second toes to reduce big toe pain.
Also, I have to make sure that my shoes don't bend my big toe inward toward the second toe, because that really increased the pain in the big toe joint. Contrary to the usual advice, I have to get dance shoes a full size bigger than my street size to have enough room to keep my (rather long) toes straight. That also leaves room for the orthotics.
I totally agree that dancing in orthotics isn't ideal--but neither are my feet! They do help me. A painful big toe joint has sometimes kept me from putting any weight on the inside ball. Dancing with your feet rolled to the outside is really ugly--I have the tapes to prove it! I've accepted that my terrible feet are probably going to limit my long-term competition success, but what can I say? I'm addicted!