I guess the birth pool is out if you are in a cast. Fitball could definitely help you move your hips etc without pressure on your foot. a stool to kneel your sore leg on could also work if you want to half stand. Having a partner who you can hang off could also help.

Active labour to me doesn't mean big walks but more ability to change position and rotate and wiggle your hips and tummy as you feel the need.

Labour might help you forget your sore foot, or the other way around.