There is AES67 support in PipeWire as of 1-2 years ago. I've tried it with some Dante hardware that I own, running the hardware in AES67 mode. It didn't work very well for me, even after lots of fiddling. If the experience would have been better, I probably would not have started working on ETH-68. It might be better now, I hope that it is.

ETH-68 doesn't have nearly as broad of scope as AES67. It is a much simpler system, so easier to realize for a 1-person team working on weekends.

Just a few other comments: 1. AES67 usually means Dante hardware which is notoriously expensive. 2. Dante devices running in AES67 mode often (always?) have their capabilities reduced. At least in some cases you are limited to 48 kHz, and I believe you are also limited on latency compensation settings. Someone with more experience could chime in.