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hippy-
Maybe I was dreaming then and all the versions I've seen have been DIY/bodged extension brakes.
No, there are definitely brake levers which fit on your extensions (any MTB/flat bar, plus some specific TT supplementary levers)
Jtek (also sold by HED):
FSA/Vision:
and there are levers which plug in to the end of 22.2mm bars too, DiaCompe make a thin version of the 188 for town bikes.
gbj_tester
This. Extensions are 22.2mm OD, most bars (everything but Vision) are 23.8mm.