Sounds awesome. You can always taste before you bottle. Maybe take a sample out a few days before you want to bottle and if it's not orangie enough for you add some orange peels boiled in sugar water (with out any of the white rine on them).
you can even measure out small quanities of beer and add different amounts of orange and/or vanilla until you get three flavor you want. Then a little bit of math, and some measuring, and you'll have what you want.