Not sure if this is really what you're asking, but you could just swap IPs so that everything pointing to the old server now points to the new one. That, I feel, would be the easiest way to do it. Otherwise, you're looking at a very manual process. The agents might have some kind of registry key that you could change and then update all of them via script/GPO, but I'm really just speculating. Anything forwarding Syslogs would be dependent on the specific node.
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