I thought I'd also point this fellow out. I havn't read through all your compression tweeter compensation notes but I thought these pose an interesting option.PE# 260-160
Has the same 12db low pass & 18db high pass characteristics as the Eminence pxb with a built in L-Pad for the tweeter attenuation. I'd be inclined to replace the cheap pot with a fixed resistor once it was dialed in but might be a nice all in one solution.
Any comments Wayne?