Acupuncture or refelxology might be useful as well, WRT bringing on labour.

There is an article on the main Bellybelly site here on natural induction methods.

I was induced at 10 days overdue, with prostin gel, I only needed the one lot of gel, and that was it. I did have gas, but was quite happy to have that, and found even after the induciton my hospital were really supportive of my birth plan.