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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
Tijmen
gbj_tester
Could one machine a thingy that presses into a normal 1 1/8" headtube (34mm) which widens to 44mm for a 1 1/2" adapter headset thing at the bottom? Would it adversely affect the lifetime or operation of the headset somehow?
How long would it have to be? There doesn't seem to be a standard taper. There are some forks like this that it seems you could probably bodge in:
And others like this that would be difficult:
Probably one for @mdcc_tester
Edit: 30s diagram attached
Edit: obviously you've effectively increased the axle-to-crown a little bit. Not overly concerning to me personally.