Hey
@zzmadd. A couple of things to think about, I believe HDMI audio is available through FakePCIID.kext, FakePCIID_Intel_HDMI_Audio.kexts. I would also add CodecCommander.kext (see screen shot). Additionally I recommend you move your kexts from 10.14 to the "Other" folder.
I also noticed your config.plist could use some changes in Devices/ Audio. In the second screen shot your config.plist is on the left, mine is on the right. Notice the difference showing Audio Inject Number 11. I use Xcode to edit and that's what that screen shots is from. My whole EFI Folder is in this thread in post number 903 if that is easier, it should work for you.
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