I'm seriously considering jumping on the SMS-1/OAW3 combo that Outlaw is currently offering. Hardwire from my 970 to the SMS-1. Hardwire from the SMS-1 to the front sub: about 6 feet in my setup. Wireless from the second output of the SMS-1 to the second sub.

You could do something similar although, obviously, it's more $$ than gonk's approach.
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975/7075/SMS-1
Aperion Verus Grand Towers & Bookshelves, Verus Forte Center, Infinity Surrounds, Ultra-X12
Oppo BDP-203, XBOX360, Xbox One
LG 65" OLED
RR2150 w/Klipsch SCR-2