So, this was totally unexpected.....
I created a USB drive, had to use Clover to create an EFI (lame instructions from Opencore folks....one of many unfortunately), then copied Ellybz's edit of filmkr's EFI (which is very close to the system I am now running - I haven't received my Asus Sage yet).
Then, well, what the hell, I just rebooted. Didn't edit anything, and bang, there it was. It loaded perfectly (well almost), and it was fast! My Radeon VII is here, most of my other stuff from System Info is here.....
Then I edited TSCAdjustReset for my number of cores, set the timer for 10 seconds (which basically made it stop dead and wait which is fine for now). Then I set the ScanPolicy for 0, which is what I want (for now).
I highly recommend using Xcode, because I couldn't see the Platforminfo until I loaded the config.plist via Xcode. Once I could see the Platforminfo, I could then edit the Serial Number, etc. Don't see where you add the UUID though, not yet....anybody know where that gets entered?
I'm a little taken aback.....I almost feel like it shouldn't have been that easy.....kudos to @Ellybz