Just a query on the power head: can you use the power head's powered output as part of a stereo pair - with a monitor out or line out. This would mean that you could drive a cab directly with one of the stereo channels and send the other side of the stero pair to a power amp + cab OR an FRFR monitor.
Ideally, you could set up a volume offset to match levels of the two channels of the stereo pair so that they could be controlled with the KPA volume knob.