As you have found out yourself techniques which revolve around setting an artificial block don't work well. That's because they fail to really address the problem. As soon as you move into an environment without those blocks the addiction will return instantly and your willpower "training" will have be a waste of time.

Unfortunately it seems the only real method is indeed "toughing it out". Books help a lot in this regard as whenever you feel the pang you can start reading. Since this activity involves concentration over longer periods of time and no task switching, it's tremendously helpful to rewire your brain over time. You definitely feel the effects after a few weeks.