I got it up and running since 10.13.x, I know basics obviously (although "basics" is a relative term here) but I don't have time. I don't have time to commit, I'm getting older, I work a lot, have a family, home, etc so "demanding" is more a frustration for me than it is for you.
A BIOS update of my Z370-F left it usable but trying to get into the BIOS was impossible (and of course I need access for boot override), always a black screen no matter if I used the iGPU or Radeon VII no matter what port (HDMI, DP of either). I swapped in an Asus Z390-F and I'm still not able to boot into macOS on the hard drive or the Mojave installer USB that had my last, successfully working EFI partition.
The best course of action I can think of is to install Z390 drivers into the EFI of the Mojave installer from my old MacPro and see if that gets me up and running—what extra drivers do I need for the Z390 as opposed to the Z370? I'll either find out on my own or someone will help me?