Card-carrying AES member here.

The X32 module interface is actually fairly simple: it's more or less just four 8-channel I2S TDM streams going in either direction. Easy peasy to interface with, nothing as complicated as AES50 involved.

AES50 itself is actually a standard; you can buy a copy of it for $50. It's basically just "Ethernet with fixed addresses and a custom frame format across two of the wire pairs, a super fast (64x the sample rate, with a -12.5% followed by a +12.5% duty cycle pulse every 2048 samples) clock signal across the other two". I've been meaning to whip up some boards that speak AES50 one of these days, just for fun.

A router would be totally possible, with of course the caveat that AES50 itself is point-to-point so you'd need some sort of out-of-band mechanism to tell the router where to send all the incoming audio streams it's receiving.