Last I knew, you could get Tektro Cross Interupter levers in all silver from Velo-Orange. Would those work? Interupter levers might not be ideal, but I think I've seen people use those before, no?
Edit:
here's the link
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Bikes: 1996 Eddy Merckx Titanium EX, 1989/90 Colnago Super(issimo?) Piu(?), 1990 Concorde Aquila(hit by car while riding), others in build queue "when I get the time"