I'm getting ready to prep my current Catalina build for a Big Sur installation a few weeks after the official release of the new OS tomorrow. I plan to do this by making a bootable backup of my current deployment, testing the backup, and then wiping my main boot disk clean and installing Big Sur as a ground-up fresh installation. I will be using a new serial number and installing all applications as "new" deployments -- I made the mistake of doing a Migration Assistant transfer from my prior mackintosh for my Catalina deployment on this build, and it created some random crashing I'm looking to avoid with a ground-up build.
With all that said, I do have a question for which I'd appreciate guidance --
should I continue to use my Fenvi WiFi/BT card, or should I move over to the on-board Intel AX201 WiFi/BT module with the OpenIntelWireless driver? My primary network connection is Gigabit Ethernet...I use the WiFi/BT connections only for things like Continuity and Handoff which are pretty important for me. But I suspect that the problems I've had in getting my Apple BT keyboard and trackpad to work well in EFI and OpenCore as well as my dual-boot Windows environment (used pretty sparingly, I admit) are because they are paired to the Fenvi card and not to motherboard-native hardware.
Continuing to use the Fenvi card (which seems to work just fine for both WiFi and BT, aside from complaining that my Apple Watch is frequently too far from the computer to enable auto-unlock) is certainly fine with me...I just wonder if I might need to disable the on-board Intel card under Windows and force that OS to use the Fenvi card as well to better enable use of the BT keyboard and trackpad.
Advice welcomed -- and again, HUGE thanks to
@CaseySJ for this guide and the continued support!