All great ways of righting a fallen bike until you are off road and in Mud. Under those conditions I have always been fortunate to be riding with 1 or more gentlemen who were nicknamed Moose, Mongo, The Neanderthal, Knucks or The Creature. Being a good boy scout I have given a thought about packing pulleys and rope in case of a really difficult lift. Where I live there is always a tree nearby if you are off road. A Cheezy (but sturdy) little Block and Tackle set up could be helpful and pack small.