Well this is the exact motherboard you're having... I upgraded from an x370 wifi motherboard which I removed the wifi cause it makes the computer lagged and rebooting over and over again...I use my BCM94360NG for windows, Linux and MacOS (I removed my Intel card and replaced it with the BCM94360NG) and there’s no problem at all wifi and Bluetooth wise in any OS.
5.0 Bluetooth really doesn’t make that much difference depending on why your using it. If it’s for headsets and controllers while gaming then I wouldn’t worry about it one bit.
It might be lagging to connect for you in windows because your not using the right drivers or maybe because you have both cards enabled.
On the flip side I guess I could have a pop at making you a ssdt but I would need a copy of your IO Reg to do it and even then I might fail cos it’s hard for me to do it blind. Il give it a crack for you if you like though….lol
Guide wise if you want to do it yourself there’s not one that I know of but thinking about it you could use the same method that you use to block out a NVidia GPU from MacOS you just turn off a different slot connected to your Intel wireless card.