Yes, once you understand horn design theory.

Your design is a simple pipe horn with no well defined low pass filter [the front chamber of a FLH]. The 'BIB' calculator will spit out a simple conical/parabolic pipe horn. Viewed another way, a horn's filter chamber is a typical vented speaker box where the vent opening is the throat of the horn, so once you understand what you're trying to do, you can design a good enough scoop horn using a simple vented box calculator such as BoxPlot or similar.

I haven't read them, but MJK has written some papers on horn design that will probably be helpful and for sure, any typical speaker design will sim more realistically using his MathCad software than HR's 'ideal', no damping, plots that tend to be very misleading if you don't know how to interpret them: Horn Theory

Anyway, there was a design routine posted on the DIYaudio 'full-range' loudspeaker forum several years ago that folks were satisfied with its results, but unfortunately I've lost the link and don't recall the author, but searching the forum should turn it up for you.

GM