Just install Mojave with the guides here and it's somewhat working.
My laptop keyboard and mouse doesn't work in clover (both PS2 so that may be the issue), so I had to use an USB keyboard both for installation and now for boot, in macOS they're working fine.
Also I couldn't install with default SMBios, I have to change it in Clover every time (iMac13,1 works fine).
So attaching the my app file to hopefully fix some things.
Send me Douglass-iMac.zip