Hi. I posted practically the exact same post about 6 weeks ago!!!
Inthe end we didnt do it, we just kept trying her, she eventually took a dreamfeed from a haberman bottle, so we kept that up for a week, and then we tried her when she was awake.....and result!!!! Now she will take up to 5oz from a bottle and i am back at work.
Most of the advice i got at the time was not to try the cold turkey method, i know we very nearly came to it though, but i was really dreading it! I know it has worked for some too. Sorry i cant offer a definitive answer. Love