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Do you absolutely require a redirect? If these are just old ads, you could set up a Domain Alias instead (in certain ways the opposite of a Redirect Rule). This will make all LPs available at both old.example.com/lp.html and new.example.org/lp.html.
This won't redirect between old and new, however, unless you also add a little snippet of JS.
That was the start of it.
I created the Domain Alias then was able to create redirects with the old URLs. We took all our landing pages and created new pages with a small variation in the URL but after creating the alias we were able to to just sent a redirect rule in Marketo. Thanks for the jump start.