Unless finding another provider is an option I would be very honest and say "I know that ultrasound weight measurements are very innacurate and I know that induction increases my rate of u/r , where as being overdue does not."
Then he can go on and on and you can nod and say ok thanks I'll think about it and then not answer the phone.
Good luck and stick to your guns, sister! Sending successful VBAC vibes your way... and Grrrr-ing : over your doc, too.
Oh, and btw, my third baby was a wonderful HBAC after successful hospital VBAC w #2; c/s w #1 was failed induction due to AROM without my consent or prior knowledge!... ANYway, my second was 8lbs3oz (seven days "late") but this last little guy was 10 lbs 8 oz and ELEVEN days "late"... your body knows what it's doing - don't let your doc pressure you and don't worry about baby's size.