Immediately, phase issues come to mind as you will need an adapter to get the 802 onto any existing "y" which creates unequal length throats. Of course, one of the throats of the "y" could be shortened to compensate.
IMO, much of the 802's HF advantage would be lost in the length of the horn path.
HF energy dissipates quickly. A few feet out of the horn a gentle breeze can blow it away.
BMS tackled this problem in a way that other companies have followed, a coaxial driver.
Note that both elements are ring radiators.
Of course, something in a similar vein from the Harman folks:
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