You could split the crossover in two (between highs and lows), then use your IcePower for the bass, and 300B for the treble...
Your Freya as 3 sets of outputs (single ended x2 , differential x 1), so hooking two amps shouldn't be a problem, you just would have to attenuate the signal entering the Ice (I imagine it has a higher gain than your 300B) using, for instance, the inexpensive Schiit Sys.
Dry bass, but heavenly highs await...