I'm not sure about the power handling issues. The PDF on that unit has the power handling at 1.2 kHz, 12db/octave at 100 watts musical, so maybe 50wrms. That's probably what I would recommend, except 18db/octave crossover instead. With that, you should be fine.

I would also recommend impedance compensation on the compression driver. The impedance plot shows two distinct spikes right in the xover point region, which will probably change the function of the crossover. Impedance compensation should flatten these peaks.

Adam