If further experiments are promising enough, I would try this board for the receiver:

https://www.olimex.com/Products/OLinuXino/A13/A13-OLinuXino-WIFI/

I have been running Pd on this board for a few weeks now. In general, it works OK, but the ADC is not so good and adds a lot of latency. Just DAC output can be 10ms latency with passable sound. All of the Pd example patches run fine with the FFT ones topping out around 50% CPU load. That's with nothing else running. Any network activity will cause dropouts even at large buffer settings though.

The WiFi works with a few tweaks to the settings for your network.

The drawback with the Allwinner based chips is you have to take whatever the chip maker gives you for documentation and drivers (slim and none basically). The Chinese SoC makers have zero interest in orders less than a half million units and they mainly make those under $100 7" tablets and bad set top boxes. If something doesn't work, then it likely won't ever work - don't hold out for improved ALSA drivers for example.

I would see what the new BeagleBone looks like too. It's supposed to be cheaper and improved plus TI does support open source better than most.