Have a friend who went overdue with both her babies.
To avoid induction with her second she tried EVERYTHING but what seemed to get things moving was acupuncture.
A wonderful friend paid for it as an alternative to an unnecessary baby gift.
Previous to this, said friend bounced on ball, ate curry every night, managed sex (and oral, she was desperate) drank pints of raspberry leaf tea, etc, etc.
Went for acupuncture as last resort before induction and had the baby 10 hours later. Worth a try IMO. Good luck!