Hi, I was monitoring your amazing project for a while and yesterday evening I tried to test it on my two hackintoshes:
Following your instruction (my Bluetooth card is a Gen1...) it is working fine on Intel NUC7i3BNH as you could see in the following image:

but it is not working on my Huawei Matebook X Pro:

I attach also my standard Bluetooth HCI on Matebook X Pro:

and also my working Bluetooth using IntelBluetoothFirmware project on Matebook X Pro:

I would also to underline the following fact: Bluetooth cards on NUC7i3BNH and MatebookXPro are working fine with latest IntelBluetoothFirmware loading ibt-12*
firmware
I don't know whether what I reported could be useful for your development...
(my USB mapping ports should be rock solid in both cases...)
Edit:
- on NUC7i3BNH I loaded the Catalina release for your project (I'm running Catalina 10.15.7 with latest security update)
- on Matebook X Pro I loaded the Big Sur release for your project (I'm running Big Sur 11.6.2)
good first issue question