I fashioned a makeshift chainwhip by taking a piece of aluminum bar stock 3/16" thick x 1 1/2" w x 4 1/2" long and drilling holes in it so I could arrange chains on it similar to a chain whip. It weighs very little, fits in my under seat pack and does the job in a pinch.

My new roadbike came with a crappy wheelset and was breaking at least 1 spoke every ride. This tool, a cogset remover, a spoke wrench and carrying spare spokes always got me home.