Here's a cleaned up EFI folder for you. I used to have your MOBO, so had an older folder I could look at for reference. Note that I also set up your USB Kext so you don't need to use a USB Limit patch, which makes upgrading OS updates much easier and cleaner. The Designare EX has a ton of USB hubs so if you see that some of your USB ports are not showing up (which shouldn't be an issue) let us know and we can figure it out and modify your USB kext.
Also I am just following your specs, the 7920x and Radeon VII...unless any hardware changed, this should be good to go.
As a precaution, always keep a backup of your current working EFI before you swap it out with any other one. And always have a Windows partition installed on a separate drive for easy troubleshooting (such as mounting an EFI folder, swapping stuff out, etc)....and also it's best to have a clone of your main OS. I personally use CloneZilla to do a 1:1 copy of the boot drive to a secondary drive (which I am using as external now, but always disconnected)...this way if the main OS drive goes down I can boot from the clone. Or clone back to the main NVME to "restore" to a working state. One downside with CloneZilla is that both the main and clone drive must be the same exact size, so if it's 1024MB the clone has to be 1024MB as well...
Also for controlling the audio/brightness controls, you can use
MonitorControl (Just have it auto start on login). I am able to control the volume and brightness on my LG38U99 with a Apple Magic Spacegray Keyboard.
Also you might need to enter your current UUID into the config.plist under
config.plist > SMBIOS > SmUUID by running this in the terminal and then copy/pasting the string into your config file. This will help with iMessage issues.
Good luck and enjoy