One potential work around here would be to create a dummy activity that has all these settings applied and then simply create a copy and edit the copy to customize the location (URL), audiences, etc.

Dan,You can also enable traces in the Experience Cloud Debugger which enables you to get the trace information as long as you are logged into the Target in the same browser.  Using the Experience Cloud Debugger is discussed in our knowledge base here:Troubleshoot content delivery

At this point there is no functionality it Target to delete them and you do have to wait for them to expire.