Those shifters come off and will fit on the Rivendell bar end pods. You are going to need the flat spacers that they sell also:
http://www.rivbike.com/product-p/sh21.htm. Cheap 6 speed thumb shifters mentioned earlier are also a good option:
http://www.niagaracycle.com/categori...ft-6-speed-sis and
http://www.niagaracycle.com/categori...ht-6-speed-sis. The mountain bike drop bar thread is full of info about mounting non-road bike shifters to road bars:
http://www.bikeforums.net/showthread...ar-Conversions. Good luck.