SUCCESSSSSSSS!!!!
Ok finally got my system (Z370 MSI, 8700k, Vega 64, DW1560 [WIFI+BT], iMacPro1,1 SMBIOS) running perfectly with Catalina. I had to update clover to the latest version, update all the clover drivers like aptiomemoryfix.efi which I was having issues with especially iMessage, Facetime, and AppStore not working because of this. Also, all kexts (WEgreen, Lilu, AppleALC, intelMausi, etc) including switching to BrcmBluetoothInjector.kext by acidanthera since Rehabmans version gave me issues. I have my own USBKext so didn't need to touch that. Before all the updated kexts and drivers, I was having issues with installation and post installation. I recommend to update EVERYTHING as much as possible prior to updating MacOS to avoid these issues.