I finally managed to get audio working!
It's probably that the latest versions of the Lilu and AppleALC kexts don't accept the legacy injection for the layout-id anymore. I found the following information
I used Hackintool in order to generate the necessary code to copy and paste into the existing config.plist (removing the placeholders with hashes which were in there from Rehabman's config.plist) and I now have audio!