Or just go retro with dia come ene bar end shifters currently $69 at Wiggle,
wiggle.com | Dia-Compe Bar End Gear Shifter Set | Gear Levers And Shifters Road
It will work with a suntour freewheel or a shimano freewheel. It will work with pretty much any front derailleur you throw at it. And I'd rather have a shifter for the front derailleur on a triple that I can trim.