I have a Windows 11 IoT LTSC installed in a VM on my machine with 4 GB assigned. It just has to run iTunes, Firefox with nothing open and otherwise idle.
It was unusable/buggy as hell when I disabled swap so 4 GB + a couple gigs of swaps in my experience is the absolute bare minimum.
massgrave gets you the updates without an MS account. I have it deployed on a couple machines.