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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
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30s diagram attached
1870s load analysis says that the further the bearing is extended out of the press fit in the head tube, the more the radial load on it will tend to tip the cup out of the head tube.
Tijmen
gbj_tester
@frankenbike
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.
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