Go to the updates file system location, and create your custom script.
Go to the Advanced tab of the Bulletin's policy, press the Command Line link, choose Custom, and provide custom script file name, Apply.
You'd need to disable the patch policy and creat a managed software delivery policy. Separate from that, creat a task that is just your batch file (I'd suggest using a run script task and putting the contents of your batch file in the command script). ...
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