Well if you are on a deadline that makes it easier in some respects.
My advice would be to drop a feed every two weeks. I've done it weekly and it sent my system haywire, every two weeks the second time around worked much better.
Don't crack and BF at the times you have dropped. Offer the formula, and don't make a fuss if its rejected before or after only 5mls. Distract and do something else and offer again 30 mins later and so on.
If your DD gets a cold or is unwell you may have a good opportunity as she will want to nurse rather than eat solids and will be less resistant.
Pick a brand and stick with it. We tried every brand and bottle going with DD1 and she wasn't having it, any of it. She stopped drinking milk entirely and we had to put it into all her food, runny yoghurt, soupy weetabix etc etc and lots of cheese. She's fine and loves her milk now but wouldn't touch the stuff from 7 months to about 18 when she discovered the delights of cold milk midsummer.
Don't make a fuss. Don't keep pushing it. Don't let your partner push it* if you are not around. Just offer it frequently in a disinterested manner, but not in the manner of Mrs Doyle
*DH was very task driven and would just go on and on with trying to get her to take a bottle.
I've had two bottle refusniks and was successful the second time around with the no fuss approach. I carried on doing a first thing and a bedtime feed until about 8.5 months with DD2 but she completely cracked around 7 months when she got ill. Because I simply didn't have the supply it was her only option.