I would say absolutely try your best to speak with him about it. I mean you could say something like " i know we didnt leave on the best terms, but this isn't really about me and you it's about a promise i made to your daughter". Flattery by the way will get you everywhere, something simple like " i know your a wonderful father and i am sure you can put aside your feelings towards me and realize how important this may be to your daughter". Hopefully he will see the value in the trip but if he doesn't, try to keep calm and just be pleasant and say "OK i understand, i would have really loved to take her but you are her father and i will respect your wishes, but if you happen to change your mind please give me a call." If you leave on a really good note he may actually consider it, even after he said no. I sure hope he lets you, best of luck and do keep us posted.