In reply to sjc:
Typically pitons in the Dolomites are either a)already threaded with a bundle of rotting cord or pieces of wire b)only half way in (or out depending on your fear level). Threading them with doubled Kevlar will probably be a pain and 6 or 8mm Dyneema easier.
Kevlar slings are popular in Italy for threading the brutally sharp solution holes on gets on a lot of the limestone as they have better cut resistance, in a lot of the guide books they are specifically mentioned.