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gbj_tester
If I understand your question correctly Cane Creek already makes what you're looking for:
http://www.jensonusa.com/Cane-Creek-40-Series-EC4440-Bottom-Cup-Black-15-Crown-Race-EC44-Lower-Tube
CRC also stocks it, but I link to jenson because they have a better description.
http://www.chainreactioncycles.com/nl/en/cane-creek-40-series-ec44-40-bottom-assembly/rp-prod115641