I uploaded a quick and dirty profile to the cloud, it’s named ‘Unreal 5’. Immersive screen with a bit of head tracking, which is nice for flying around.
The Ironman demo wasn’t downloadable (limit reached), the profile was made with this Superman demo. Not 100% sure whether it will work with the Ironman version, but that’s quite likely.
Hint: Works reasonably well at 2560×1440 with an RTX3080. At least the Superman version doesn’t seem to have an official way of switching resolution though. If necessary set the desktop res to the res you want to play the demo with before launching it for better performance with mid tier GFX cards.