Look at Cotton Carrier, they make a chest rig that you can mount your camera on that holds a 400-600mm lens and you can adjust it to your eye level and it will stay. Also they are a small company and you might be able to ask them to make a custom one for your disability.
Look at Cotton Carrier, they make a chest rig that you can mount your camera on that holds a 400-600mm lens and you can adjust it to your eye level and it will stay. Also they are a small company and you might be able to ask them to make a custom one for your disability.