All GPOs settings are hard-coded with registry , according to your policy settings For users, to Remove access to use all Windows Update features we could edit below registry key:
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\WindowsUpdate
DisableWindowsUpdateAccess
Prevents users from connecting to the Windows Update website.
Range = 1|0
1 = Enabled. All Windows Update features are removed.
0 = Disabled or not configured. All Windows Update features are available
I would suggest with creating a new policy with register hive gpo settings referred to above path by deleting the key for one or two server and place it to all servers based on OU / Domain level