If you have an iPad, Roland make a free editor app which allows you to fully edit all the Keyboard Parts. Including selecting MFX, editing MFX, EQ's etc.

Now, while this won't work on the Song Parts, you might be able to record its output (use through from the BK9 to your DAW). This would give you a sysex string that you only need to change the header part to address the 3 Song/Style MFX's..

But, bottom line, you really need to dig into the MIDI implementation manual. The codes for inserting MFX and all their parameters are there. Back in the Sound Canvas days (which powered Roland arrangers up to the G1000) that was the only way to do it, roll your own!

It's a complete PITA, but nowadays there aren't any better supported Roland keyboards that use the same sound engine as the BK9. It's very much a Frankenstein monster, made from bits of this, bits of that, so an editor for something like an Integra7 won't work on the BK9.

Quite honestly, I tend to deal with the MFX last in the process, when I mix the project in the Makeup Tools. The DAW I just mostly use for editing the notes.