You can just add an xml to your win11 iso. You can do a lot of things with it, like skipping the privacy answers, setting the dark theme (even if you don’t activate windows), preventing the microslop store from preinstalling adware or even preinstalling virtio drivers for qemu-kvm.

schneegans.de/windows/unattend-generator/

If you just want to skip the online account the easiest option is to create the iso with Rufus, which is the easiest way to add that xml to your iso.