Hi Mike,
The Success and Error URLs are going to be a static return, so I understand why you are struggling with setting things up the way you've described.
Would you consider using a programmatic post method for the forms you want to repeat? (http://help.clickdimensions.com/programmatic-form-capture/ )
You might have some other options, like changing the URL that gets displayed by appending some parameters from the form fields, or perhaps opening up a new tab or window with a url + parameters.
With programmatic form capture you would have greater control and flexibility: http://help.clickdimensions.com/programmatic-form-capture/
-Nick