The typical method I played with years ago was to add the last half of the DME/LME the last 15 minutes of the boil. Here is a quick article explaining that method as well as how to calculate your utilization. Not sure if you have seen this already.
http://www.brewersfriend.com/2008/11/02/money-saving-tips-hops-utilization-factor/I am not sure why you would want to do this, especially with a lager that is not hop-forward...an IPA perhaps. Hops are fairly cheap. Let us know how it turns out.
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