I don´t know about the KH120II/150 - maybe they are different, but with my KH750 the shelves are not fixed. The bell filters are more variable though. You can set up to -24dB.
But yes, i tried it quick and dirty for you - i think you mean it like this:
View attachment 285186
Or this - and so on.
View attachment 285187
The values are not "correct" - i just typed in something that looked half way okayish.
Personally i would not do it this way though. It´s probably better to make the satellites flat and implement the crossover differently (e.g. through the subwoofer).
It is much more easy to integrate the subs if you follow
@enricoclaudio ´s path with the MiniDSP and Dirac though.