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gbj_tester
stelfox
Hope and Chris King make plates for this. So to use a CK inset 7 (which I think is the same spec as your headset you want to use?) with a 1 1/8 steerer you would get the 'devolution baseplate' to go from 1 1/8 - 1 1/2.
This Hope? https://www.inspiralcycles.co.uk/components/headsets-spares/hope-15-inch-headset-reducer-steerer-tube-expander__2485
Edit: seems Cane creek do too? https://r2-bike.com/CANE-CREEK-crown-race-40er-series-EC-ZS-IS52-1-1-2-reducer-to-1-1-8-steel