I agree I would use Barcons or even something funky like a thumbshifter.
It would look weird but I would leave the stops on and use the clampons, if they don't interfere witht he cable. Most bikes with clampon shifters had a little brazeon of some type on the bottom of the DT to help prevent the shifters from slipping.
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“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk