I don't really see much of a way solution, considering your current level of resources. As a very last possible resort you could have the DMZ server email the requests to an account on the Intranet server for processing (which is a whole different security concern), then the intranet server could post the results to a form on the DMZ server. This would REALLY slow the process down, but I believe it to be at least an option if there are not any others.
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