I had this same thing Twiglett - I gave dd a bottle of EBM a couple of times a week until she was about 6/7 weeks and then I stopped because bf was so much easier. She is now 6months and she does take a soft spout (we use the Avent Magic Cup). She won't take EBM from it but will happily glug back 2oz of water or diluted juice. I think she knows that breastmilk can come from a much nicer receptacle if she's awkward enough.
I wish, with hindsight, that I hadn't stopped giving her a bottle. If I were you, and I could wind the clock back a few months, I would get in the habit of giving her a bottle once or twice a week of EBM so she doesn't become too fussy.
Hope this makes sense and is of some use,
mit x