My simple solution for this for the last couple of years of using Win11 on a fileserver at home has been to use "Pause updates". I choose "Pause for 5 Weeks" and try to schedule a manual Check for update, update and reboot once a month, but of course if i don't remember.. the server reboots itself after 5 Weeks ;-)
I also use this "Pause updates" on my media PC connected to the Home Cinema, hate updates during watching films and series..
Will try this "Active hour" trick to see if that works.
Arild