Mac Pro 5,1 on Monterey 12.7.6, Wifi working but no BT

Hi,

I have a Mac Pro 5,1 that I have successfully installed Monterey 12.7.6 on using OCLP. I have the original Wifi and BT cards in (AirPort Extreme, BCM4350C2).

The OCLP Legacy Wireless patch has allowed wifi to work, however BT does not seem to work. The button to turn BT on in system settings is enabled, however clicking it does nothing. In System Report under BT, I am greeted with this:

Bluetooth Controller:
Address: NULL
State: Off
Chipset: BCM_4350C2
Discoverable: Off
Firmware Version: v0 c0
Product ID: 0x0001
Supported services: 0x382039 < HFP AVRCP A2DP HID Braille AACP GATT Serial >
Transport: USB
Vendor ID: 0x004C (Apple)

Is this a case of 'you just need to buy a newer BT card' or can this be salvaged with patches/kexts? I don't particularly mind not having BT, but it would be nice if I can enable it on this machine.

Thanks for any and all help.