Here's my setup :)
https://github.com/QuantumShqipe/Opencore-0.6.5-Msi-B450-Tomahawk-MAX
Everything except for sidecar works and that's due to a lack of igpu - which is not needed since we have a graphics card etc.
Smbios = imac 20,2 (Does not have to be iMacPro1,1)