Hello, thanks to your help I was able to install Monterey on my 3020SFF (i5-4570S, 12GB RAM, no dGPU).
Everything works great EXCEPT the missing option "AirPlay Display" in Display. Attached you can see the Display Option from another 3020SFF user:
This is from my settings -> Display:
As you can see the whole option on the bottom left is missing.
Do you have any idea why there is no option?
Thanks a lot!
On a side note: the first time I installed MacOS the screen turned black at some point. After digging for a while I realized that it was an issue with the deviceProperties in config.plist. After deleting the PciRoot(0x0)/Pci(0x2,0x0) entry it booted without any issue.
I could set up screen sharing so when adding the HD4600 to the DeviceProperties again I started the 3020SFF only to realize that Monterey started normally even if the screen stayd black.
After a while I realized that this was an issue with my screen: when trying to change the input my onscreen menu was flickering. Turning the screen off and back on again solved it.
Somehow the iGPU cannot wake up the screen or something like that.
I use a DP to HDMI Adapter, quite an expensive one in order not to get some crappy adapter.