As a follow up to this thread I’d started a few months ago…
I was ultimately led to this solution for a replacement driver for MacBookPro that works perfectly on my 2019 iMac:
I had been stuck using the LTS (6.12) kernel for a while. But using this driver patch above solved the problem. I can now play audio on this Apple desktop again when booting up into kernel 6.17.9 (zen).
Hope this info helps someone struggling with a solution to a similar problem here in EOS world.