There is solution based on the third-party commercial CozyRoc SSIS+ library. CozyRoc has implemented data flow destination script, which creates memory-efficient range dictionary object. The dictionary object can then be used in CozyRoc Lookup Plus component. For more information and demonstration how to use the script, check here:

http://www.cozyroc.com/script/range-dictionary-destination

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SSIS Tasks Components Scripts Services | http://www.cozyroc.com/