I'm sorry you've had such a disheartening experience with the midwife -and I'd agree that with 2cm dilation and a fully engaged head why she couldn't do a sweep I have no idea. Did she have very short fingers?
Onto the positive, proactive stuff though.
I'd echo what the others have said - positioning is likely to make the biggest difference here. If your baby is back to back then it won't be applying pressure to the cervix in the most effective way and will not be giving your body the best signs that all is ready to go. Plus you don't really want to go into a back to back labour if you can help it. Try to get baby shifted first - you'll be in for a swifter, more comfortable and efficient labour with a well positioned baby.
The spinning babies site is fantastic - I'd be trying several of the techniques on there if I were you. And don't lie on your back or lean back on the sofa at all. Only side lie, or adopt upright or forward leaning postures. Scrubbing floors is definitely something to consider.
You know your stuff MM. You've still got a week to go before things get sticky with the medics and even then they can't do anything to you without consent. I know numerous women who have negotiated continuing care for their NHS home birth after 42 weeks. They've generally had to consent to quite a bit of additional monitoring, but it can be done. A doula friend recently had a client who had her NHS home birth at 43+4! Are you on the yahoo homebirth email list? That would be a great place to go to for support on this.
I'll be sending my virtual bolshy self to back you up if you do actually make it to that appointment.
But there's still plenty of time for baby to make their appearance before then. I've got my fingers crossed for you.
Gina.