As a frequent procrastinator, I can affirm that to start is often the most difficult part (but not always). However, I would like to see your theory stated in less vague fashion. It would be helpful to know whether one can measure the activation costs (in approximation at least) or whether the hypothesis can be formally included into a utilitarian decision theory, or most generally, whether there is a testable prediction that follows from the existence of activation costs.

This implies that there would be two effective ways to beat akrasia-based procrastination. The first would be to lower the activation cost; the second would be to increase energy/willpower/ego available for activation.

Let's say I want to do some work W and I tend to procrastinate. In order to make it easier, I apply the technique T. In retrospect, T proves to be successful. It is either because T lowers the activation cost of W, or because T increases my willpower. How do I recognise which was the case?