Hey,
@CaseySJ I finally got around to updating Z390 BIOS (to F9b), Clover, WhateverGreen, Lilu, AppleAPC and then following the Mojave to Catalina (in-place) upgrade. Everything appears to be working in Catalina, although I did have to change shikigva=16 back to shikigva=80 to get Netflix DRM playback back in Safari.
The only hiccup I have is my USB port configuration is not what it was on Mojave. Is there a quick and easy way to get that back?
Thanks, once again, for a great guide and the awesome support!