Talk more about what you want, will you? The intent of the device matters a great deal and I don't know where you are well-enough to give any sort of decent answer. There are off-shelf horns all over the place, but if you, for example, want to do constant-directivity horns and directivity-match patterns at crossover, well, that's a whole other thing from just grabbing any old expo horn and designing for say 15 deg off-axis, etc. If you can't measure but can get your hands on an Eminence APT 150S 100° × 50° horn, Vance has a set of curves at
aX.
Two other quick thoughts at first.
1) To get levels matched, there's one spot where you're going to need to pad 23dB...that's a whole lot and sort of defeats the purpose of the compression driver (unless it's purely to choose for horn usage). XO's for ewaves and the like are pretty easy to build-in the padding as part of the EQ/filter when one keeps attenuation say 10dB or thereabouts. FWIW.
2) 22L sealed with those starts a shallow roll really high and, that's fine if there are subs or some other LF support. If standalone, most of those types of boxes are designed with a hump at the bottom to make them more appealing / balanced. If you go 22L closed box standalone, it will be pretty "dry" (too much for my tastes).
