yes, AES67 would be nice - but it's a lot of work and there's not much in the public domain (other than the ESP32 code you mention
https://github.com/ndac-todoroki/esp32_aes67_sender - and he seems to have abandoned it because the packet rate was unachievable, evern with a processor dedicated to WiFi.). This leaves a lot of the heavy lifting still to be done - e.g. QoS - for a proper AES 67 implementation.
I'm thinking of aligning with a simpler format in the short term - a protocol called VBAN developed by VB-Audio for their range of (largely free) windows audio programs.
https://vb-audio.com/Voicemeeter/vban.htm
Probably next will be to finish the update of the 8 x 8 channel audio board (a T4 update on Paul's original design). I've got RevB boards sitting on the bench waiting to be loaded and tested for N&D. Rev A proved the design.
After that, VBAN on the current WIZNET hardware, followed by a port to the T4.1 native ethernet (again - all the bits sitting here waiting for some time to put it all together).
Finally, something like AES67 to make a nice, compliant overall package!
Sadly, I'm distracted by other projects at the moment - like work!
Anyway, keep in touch, because I will get back to this project. It was driven by my band's need for better, personalised, foldback: 8 channel unit plugged into the desk, individual 2 channel units using Paul's SGTL5000 audio boards, transport over ethernet.