A script automating the process defined here with the fix for catalina from here
Just run sudo python3 get_BTH_Keys.py (It needs sudo to access the plist, if you're concerned about this, just open the py file and check what it does)
It grabs the keys from com.apple.Bluetoothd.plist and converts them into big endian for windows regestry.
You can then copy this to GoogleDrive (or another cloud storage)
Reboot into Windows and paste these keys under the corrosponding Interface in HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\BTHPORT\Parameters\Keys\$INTERFACE_ID
